mirror of
https://github.com/FFmpeg/FFmpeg.git
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avformat/matroskaenc: Avoid allocations for SeekHead
Up until e7ddafd5, the Matroska muxer wrote two SeekHeads: One at the
beginning referencing the main level 1 elements (i.e. not the Clusters)
and one at the end, referencing the Clusters. This second SeekHead was
useless and has therefore been removed. Yet the SeekHead-related
functions and structures are still geared towards this usecase: They
are built around an allocated array of variable size that gets
reallocated every time an element is added to it although the maximum
number of Seek entries is a small compile-time constant, so that one should
rather include the array in the SeekHead structure itself; and said
structure should be contained in the MatroskaMuxContext instead of being
allocated separately.
The earlier code reserved space for a SeekHead with 10 entries, although
we currently write at most 6. Reducing said number implied that every
Matroska/Webm file will be 84 bytes smaller and required to adapt
several FATE tests; furthermore, the reserved amount overestimated the
amount needed for for the SeekHead's length field and how many bytes
need to be reserved to write a EBML Void element, bringing the total
reduction to 89 bytes.
This also fixes a potential segfault: If !mkv->is_live and if the
AVIOContext is initially unseekable when writing the header, the
SeekHead is already written when writing the header and this used to
free the SeekHead-related structures that have been allocated. But if
the AVIOContext happens to be seekable when writing the trailer, it will
be attempted to write the SeekHead again which will lead to segfaults
because the corresponding structures have already been freed.
Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@gmail.com>
This commit is contained in:
Andreas Rheinhardt
parent
107783006c
commit
dc2f6b54ac
@ -57,6 +57,10 @@
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#include "libavcodec/mpeg4audio.h"
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#include "libavcodec/internal.h"
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/* Level 1 elements we create a SeekHead entry for:
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* Info, Tracks, Chapters, Attachments, Tags and Cues */
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#define MAX_SEEKHEAD_ENTRIES 6
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typedef struct ebml_master {
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int64_t pos; ///< absolute offset in the containing AVIOContext where the master's elements start
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int sizebytes; ///< how many bytes were reserved for the size
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@ -69,11 +73,9 @@ typedef struct mkv_seekhead_entry {
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typedef struct mkv_seekhead {
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int64_t filepos;
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int64_t segment_offset; ///< the file offset to the beginning of the segment
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int reserved_size; ///< -1 if appending to file
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int max_entries;
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mkv_seekhead_entry *entries;
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mkv_seekhead_entry entries[MAX_SEEKHEAD_ENTRIES];
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int num_entries;
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int reserved_size;
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} mkv_seekhead;
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typedef struct mkv_cuepoint {
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@ -136,7 +138,7 @@ typedef struct MatroskaMuxContext {
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int64_t cluster_pts;
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int64_t duration_offset;
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int64_t duration;
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mkv_seekhead *seekhead;
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mkv_seekhead seekhead;
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mkv_cues *cues;
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mkv_track *tracks;
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mkv_attachments *attachments;
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@ -396,10 +398,6 @@ static void mkv_deinit(AVFormatContext *s)
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ffio_free_dyn_buf(&mkv->tracks_bc);
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ffio_free_dyn_buf(&mkv->tags_bc);
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if (mkv->seekhead) {
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av_freep(&mkv->seekhead->entries);
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av_freep(&mkv->seekhead);
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}
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if (mkv->cues) {
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av_freep(&mkv->cues->entries);
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av_freep(&mkv->cues);
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@ -412,61 +410,33 @@ static void mkv_deinit(AVFormatContext *s)
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}
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/**
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* Initialize a mkv_seekhead element to be ready to index level 1 Matroska
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* elements. If a maximum number of elements is specified, enough space
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* will be reserved at the current file location to write a seek head of
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* that size.
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*
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* @param segment_offset The absolute offset to the position in the file
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* where the segment begins.
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* @param numelements The maximum number of elements that will be indexed
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* by this seek head, 0 if unlimited.
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* Initialize the SeekHead element to be ready to index level 1 Matroska
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* elements. Enough space to write MAX_SEEKHEAD_ENTRIES SeekHead entries
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* will be reserved at the current file location.
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*/
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static mkv_seekhead *mkv_start_seekhead(AVIOContext *pb, int64_t segment_offset,
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int numelements)
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static void mkv_start_seekhead(MatroskaMuxContext *mkv, AVIOContext *pb)
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{
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mkv_seekhead *new_seekhead = av_mallocz(sizeof(mkv_seekhead));
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if (!new_seekhead)
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return NULL;
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new_seekhead->segment_offset = segment_offset;
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if (numelements > 0) {
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new_seekhead->filepos = avio_tell(pb);
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// 21 bytes max for a seek entry, 10 bytes max for the SeekHead ID
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// and size, 6 bytes for a CRC32 element, and 3 bytes to guarantee
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// that an EBML void element will fit afterwards
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new_seekhead->reserved_size = numelements * MAX_SEEKENTRY_SIZE + 19;
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new_seekhead->max_entries = numelements;
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put_ebml_void(pb, new_seekhead->reserved_size);
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}
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return new_seekhead;
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mkv->seekhead.filepos = avio_tell(pb);
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// 21 bytes max for a Seek entry, 6 bytes max for the SeekHead ID
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// and size, 6 bytes for a CRC32 element, and 2 bytes to guarantee
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// that an EBML void element will fit afterwards
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mkv->seekhead.reserved_size = MAX_SEEKHEAD_ENTRIES * MAX_SEEKENTRY_SIZE + 14;
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put_ebml_void(pb, mkv->seekhead.reserved_size);
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}
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static int mkv_add_seekhead_entry(mkv_seekhead *seekhead, uint32_t elementid, uint64_t filepos)
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static void mkv_add_seekhead_entry(MatroskaMuxContext *mkv, uint32_t elementid,
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uint64_t filepos)
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{
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mkv_seekhead_entry *entries = seekhead->entries;
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mkv_seekhead *seekhead = &mkv->seekhead;
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// don't store more elements than we reserved space for
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if (seekhead->max_entries > 0 && seekhead->max_entries <= seekhead->num_entries)
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return -1;
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entries = av_realloc_array(entries, seekhead->num_entries + 1, sizeof(mkv_seekhead_entry));
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if (!entries)
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return AVERROR(ENOMEM);
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seekhead->entries = entries;
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av_assert1(seekhead->num_entries < MAX_SEEKHEAD_ENTRIES);
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seekhead->entries[seekhead->num_entries].elementid = elementid;
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seekhead->entries[seekhead->num_entries++].segmentpos = filepos - seekhead->segment_offset;
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return 0;
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seekhead->entries[seekhead->num_entries++].segmentpos = filepos - mkv->segment_offset;
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}
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/**
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* Write the seek head to the file and free it. If a maximum number of
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* elements was specified to mkv_start_seekhead(), the seek head will
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* be written at the location reserved for it. Otherwise, it is written
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* at the current location in the file.
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* Write the SeekHead to the file at the location reserved for it.
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*
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* @return The file offset where the seekhead was written,
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* -1 if an error occurred.
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@ -474,19 +444,17 @@ static int mkv_add_seekhead_entry(mkv_seekhead *seekhead, uint32_t elementid, ui
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static int64_t mkv_write_seekhead(AVIOContext *pb, MatroskaMuxContext *mkv)
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{
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AVIOContext *dyn_cp;
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mkv_seekhead *seekhead = mkv->seekhead;
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mkv_seekhead *seekhead = &mkv->seekhead;
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ebml_master seekentry;
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int64_t currentpos;
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int64_t currentpos, remaining;
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int i;
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currentpos = avio_tell(pb);
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if (seekhead->reserved_size > 0) {
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if (avio_seek(pb, seekhead->filepos, SEEK_SET) < 0) {
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currentpos = -1;
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goto fail;
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}
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}
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if (start_ebml_master_crc32(pb, &dyn_cp, mkv, MATROSKA_ID_SEEKHEAD) < 0) {
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currentpos = -1;
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@ -507,16 +475,13 @@ static int64_t mkv_write_seekhead(AVIOContext *pb, MatroskaMuxContext *mkv)
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}
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end_ebml_master_crc32(pb, &dyn_cp, mkv);
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if (seekhead->reserved_size > 0) {
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uint64_t remaining = seekhead->filepos + seekhead->reserved_size - avio_tell(pb);
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remaining = seekhead->filepos + seekhead->reserved_size - avio_tell(pb);
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put_ebml_void(pb, remaining);
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avio_seek(pb, currentpos, SEEK_SET);
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currentpos = seekhead->filepos;
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}
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fail:
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av_freep(&mkv->seekhead->entries);
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av_freep(&mkv->seekhead);
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return currentpos;
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}
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@ -1429,9 +1394,7 @@ static int mkv_write_tracks(AVFormatContext *s)
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AVIOContext *pb = s->pb;
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int i, ret, default_stream_exists = 0;
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ret = mkv_add_seekhead_entry(mkv->seekhead, MATROSKA_ID_TRACKS, avio_tell(pb));
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if (ret < 0)
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return ret;
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mkv_add_seekhead_entry(mkv, MATROSKA_ID_TRACKS, avio_tell(pb));
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ret = start_ebml_master_crc32(pb, &mkv->tracks_bc, mkv, MATROSKA_ID_TRACKS);
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if (ret < 0)
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@ -1466,8 +1429,7 @@ static int mkv_write_chapters(AVFormatContext *s)
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if (!s->nb_chapters || mkv->wrote_chapters)
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return 0;
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ret = mkv_add_seekhead_entry(mkv->seekhead, MATROSKA_ID_CHAPTERS, avio_tell(pb));
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if (ret < 0) return ret;
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mkv_add_seekhead_entry(mkv, MATROSKA_ID_CHAPTERS, avio_tell(pb));
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ret = start_ebml_master_crc32(pb, &dyn_cp, mkv, MATROSKA_ID_CHAPTERS);
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if (ret < 0) return ret;
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@ -1556,8 +1518,7 @@ static int mkv_write_tag_targets(AVFormatContext *s, uint32_t elementid,
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int ret;
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if (!mkv->tags_bc) {
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ret = mkv_add_seekhead_entry(mkv->seekhead, MATROSKA_ID_TAGS, avio_tell(s->pb));
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if (ret < 0) return ret;
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mkv_add_seekhead_entry(mkv, MATROSKA_ID_TAGS, avio_tell(s->pb));
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ret = start_ebml_master_crc32(s->pb, &mkv->tags_bc, mkv, MATROSKA_ID_TAGS);
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if (ret < 0)
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@ -1727,8 +1688,7 @@ static int mkv_write_attachments(AVFormatContext *s)
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av_lfg_init(&c, av_get_random_seed());
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ret = mkv_add_seekhead_entry(mkv->seekhead, MATROSKA_ID_ATTACHMENTS, avio_tell(pb));
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if (ret < 0) return ret;
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mkv_add_seekhead_entry(mkv, MATROSKA_ID_ATTACHMENTS, avio_tell(pb));
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ret = start_ebml_master_crc32(pb, &dyn_cp, mkv, MATROSKA_ID_ATTACHMENTS);
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if (ret < 0) return ret;
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@ -1877,16 +1837,10 @@ static int mkv_write_header(AVFormatContext *s)
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mkv->segment_offset = avio_tell(pb);
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// we write a seek head at the beginning to point to all other level
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// one elements, which aren't more than 10 elements as we write only one
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// of every other currently defined level 1 element
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mkv->seekhead = mkv_start_seekhead(pb, mkv->segment_offset, 10);
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if (!mkv->seekhead) {
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return AVERROR(ENOMEM);
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}
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// one elements (except Clusters).
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mkv_start_seekhead(mkv, pb);
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ret = mkv_add_seekhead_entry(mkv->seekhead, MATROSKA_ID_INFO, avio_tell(pb));
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if (ret < 0)
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return ret;
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mkv_add_seekhead_entry(mkv, MATROSKA_ID_INFO, avio_tell(pb));
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ret = start_ebml_master_crc32(pb, &mkv->info_bc, mkv, MATROSKA_ID_INFO);
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if (ret < 0)
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@ -2580,10 +2534,7 @@ static int mkv_write_trailer(AVFormatContext *s)
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cuespos = mkv_write_cues(s, mkv->cues, mkv->tracks, s->nb_streams);
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}
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ret = mkv_add_seekhead_entry(mkv->seekhead, MATROSKA_ID_CUES,
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cuespos);
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if (ret < 0)
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return ret;
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mkv_add_seekhead_entry(mkv, MATROSKA_ID_CUES, cuespos);
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}
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mkv_write_seekhead(pb, mkv);
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@ -12,7 +12,7 @@ fate-matroska-prores-header-insertion-bz2: CMD = framecrc -i $(TARGET_SAMPLES)/m
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FATE_MATROSKA-$(call DEMMUX, MATROSKA, MATROSKA) += fate-matroska-remux
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fate-matroska-remux: CMD = md5pipe -i $(TARGET_SAMPLES)/vp9-test-vectors/vp90-2-2pass-akiyo.webm -color_trc 4 -c:v copy -fflags +bitexact -strict -2 -f matroska
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fate-matroska-remux: CMP = oneline
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fate-matroska-remux: REF = e5457e5fa606d564a54914bd12f426c8
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fate-matroska-remux: REF = 49a60ef91cf7302ab7276f9373f8a429
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FATE_MATROSKA-$(call ALLYES, MATROSKA_DEMUXER VORBIS_PARSER) += fate-matroska-xiph-lacing
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fate-matroska-xiph-lacing: CMD = framecrc -i $(TARGET_SAMPLES)/mkv/xiph_lacing.mka -c:a copy
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@ -91,12 +91,12 @@ fate-wavpack-matroskamode: CMD = md5 -i $(TARGET_SAMPLES)/wavpack/special/matros
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FATE_WAVPACK-$(call DEMMUX, WV, MATROSKA) += fate-wavpack-matroska_mux-mono
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fate-wavpack-matroska_mux-mono: CMD = md5pipe -i $(TARGET_SAMPLES)/wavpack/num_channels/mono_16bit_int.wv -c copy -fflags +bitexact -f matroska
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fate-wavpack-matroska_mux-mono: CMP = oneline
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fate-wavpack-matroska_mux-mono: REF = c5a2b46d8b31c9c2e7bfb436f9d56f02
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fate-wavpack-matroska_mux-mono: REF = 0a1a7c6d3b413925f8261c92d1d53363
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FATE_WAVPACK-$(call DEMMUX, WV, MATROSKA) += fate-wavpack-matroska_mux-61
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fate-wavpack-matroska_mux-61: CMD = md5pipe -i $(TARGET_SAMPLES)/wavpack/num_channels/eva_2.22_6.1_16bit-partial.wv -c copy -fflags +bitexact -f matroska
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fate-wavpack-matroska_mux-61: CMP = oneline
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fate-wavpack-matroska_mux-61: REF = 22fc2a591be22657d19cab89ad6eef55
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fate-wavpack-matroska_mux-61: REF = 1f012f7c237f46f2f63089ba84c589c5
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FATE_SAMPLES_AVCONV += $(FATE_WAVPACK-yes)
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fate-wavpack: $(FATE_WAVPACK-yes)
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@ -1,5 +1,5 @@
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b09fc2f554712adbf84fe7899eb679d4 *tests/data/fate/aac-autobsf-adtstoasc.matroska
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6695 tests/data/fate/aac-autobsf-adtstoasc.matroska
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d10b73732b32f6b2f08885b40c41c77f *tests/data/fate/aac-autobsf-adtstoasc.matroska
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6606 tests/data/fate/aac-autobsf-adtstoasc.matroska
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#extradata 0: 2, 0x0030001c
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#tb 0: 1/1000
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#media_type 0: audio
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@ -1 +1 @@
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a5811caa0caba3a3f9a449b91569745c
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03d376cc2e8622e7af540d4d9809dbf7
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@ -1,5 +1,5 @@
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ffe2c21083d56764aaae7945fd146326 *tests/data/fate/rgb24-mkv.matroska
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58305 tests/data/fate/rgb24-mkv.matroska
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92861b36a8220a3dae10d91cba614892 *tests/data/fate/rgb24-mkv.matroska
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58216 tests/data/fate/rgb24-mkv.matroska
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#tb 0: 1/10
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#media_type 0: video
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#codec_id 0: rawvideo
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@ -1,3 +1,3 @@
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6604d339d44864be58b8580fe2fb52cc *tests/data/lavf-fate/lavf.av1.mkv
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55725 tests/data/lavf-fate/lavf.av1.mkv
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be4903a6a6710043383c8f38a535a8d3 *tests/data/lavf-fate/lavf.av1.mkv
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55636 tests/data/lavf-fate/lavf.av1.mkv
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tests/data/lavf-fate/lavf.av1.mkv CRC=0x7c27cc15
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@ -1,3 +1,3 @@
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a91bfdb08ff5a1e62b039748d16b07f7 *tests/data/lavf/lavf.mka
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43652 tests/data/lavf/lavf.mka
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58936d3ad4eb1372bd2e5845963fe17c *tests/data/lavf/lavf.mka
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43563 tests/data/lavf/lavf.mka
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tests/data/lavf/lavf.mka CRC=0x3a1da17e
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@ -1,3 +1,3 @@
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3cddd26ed41f34925d3f34acabab174e *tests/data/lavf/lavf.mkv
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320555 tests/data/lavf/lavf.mkv
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6ec6d6a058a85bf616e0b981bb8e383f *tests/data/lavf/lavf.mkv
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320466 tests/data/lavf/lavf.mkv
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tests/data/lavf/lavf.mkv CRC=0xec6c3c68
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@ -1,3 +1,3 @@
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4a25c53150c09537cd4fcbff8f8f14ff *tests/data/lavf/lavf.mkv_attachment
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472706 tests/data/lavf/lavf.mkv_attachment
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41b4f132ada6e0faedf92e909526a899 *tests/data/lavf/lavf.mkv_attachment
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472617 tests/data/lavf/lavf.mkv_attachment
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tests/data/lavf/lavf.mkv_attachment CRC=0xec6c3c68
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@ -1,48 +1,48 @@
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ret: 0 st: 1 flags:1 dts: 0.000000 pts: 0.000000 pos: 803 size: 208
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ret: 0 st: 1 flags:1 dts: 0.000000 pts: 0.000000 pos: 714 size: 208
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ret: 0 st:-1 flags:0 ts:-1.000000
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ret: 0 st: 0 flags:1 dts: 0.011000 pts: 0.011000 pos: 1019 size: 27837
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ret: 0 st: 0 flags:1 dts: 0.011000 pts: 0.011000 pos: 930 size: 27837
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ret: 0 st:-1 flags:1 ts: 1.894167
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ret: 0 st: 0 flags:1 dts: 0.971000 pts: 0.971000 pos: 292435 size: 27834
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ret: 0 st: 0 flags:1 dts: 0.971000 pts: 0.971000 pos: 292346 size: 27834
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ret: 0 st: 0 flags:0 ts: 0.788000
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ret: 0 st: 0 flags:1 dts: 0.971000 pts: 0.971000 pos: 292435 size: 27834
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||||
ret: 0 st: 0 flags:1 dts: 0.971000 pts: 0.971000 pos: 292346 size: 27834
|
||||
ret: 0 st: 0 flags:1 ts:-0.317000
|
||||
ret: 0 st: 0 flags:1 dts: 0.011000 pts: 0.011000 pos: 1019 size: 27837
|
||||
ret: 0 st: 0 flags:1 dts: 0.011000 pts: 0.011000 pos: 930 size: 27837
|
||||
ret:-1 st: 1 flags:0 ts: 2.577000
|
||||
ret: 0 st: 1 flags:1 ts: 1.471000
|
||||
ret: 0 st: 1 flags:1 dts: 0.993000 pts: 0.993000 pos: 320276 size: 209
|
||||
ret: 0 st: 1 flags:1 dts: 0.993000 pts: 0.993000 pos: 320187 size: 209
|
||||
ret: 0 st:-1 flags:0 ts: 0.365002
|
||||
ret: 0 st: 0 flags:1 dts: 0.491000 pts: 0.491000 pos: 146987 size: 27925
|
||||
ret: 0 st: 0 flags:1 dts: 0.491000 pts: 0.491000 pos: 146898 size: 27925
|
||||
ret: 0 st:-1 flags:1 ts:-0.740831
|
||||
ret: 0 st: 0 flags:1 dts: 0.011000 pts: 0.011000 pos: 1019 size: 27837
|
||||
ret: 0 st: 0 flags:1 dts: 0.011000 pts: 0.011000 pos: 930 size: 27837
|
||||
ret:-1 st: 0 flags:0 ts: 2.153000
|
||||
ret: 0 st: 0 flags:1 ts: 1.048000
|
||||
ret: 0 st: 0 flags:1 dts: 0.971000 pts: 0.971000 pos: 292435 size: 27834
|
||||
ret: 0 st: 0 flags:1 dts: 0.971000 pts: 0.971000 pos: 292346 size: 27834
|
||||
ret: 0 st: 1 flags:0 ts:-0.058000
|
||||
ret: 0 st: 1 flags:1 dts: 0.000000 pts: 0.000000 pos: 803 size: 208
|
||||
ret: 0 st: 1 flags:1 dts: 0.000000 pts: 0.000000 pos: 714 size: 208
|
||||
ret: 0 st: 1 flags:1 ts: 2.836000
|
||||
ret: 0 st: 1 flags:1 dts: 0.993000 pts: 0.993000 pos: 320276 size: 209
|
||||
ret: 0 st: 1 flags:1 dts: 0.993000 pts: 0.993000 pos: 320187 size: 209
|
||||
ret:-1 st:-1 flags:0 ts: 1.730004
|
||||
ret: 0 st:-1 flags:1 ts: 0.624171
|
||||
ret: 0 st: 0 flags:1 dts: 0.491000 pts: 0.491000 pos: 146987 size: 27925
|
||||
ret: 0 st: 0 flags:1 dts: 0.491000 pts: 0.491000 pos: 146898 size: 27925
|
||||
ret: 0 st: 0 flags:0 ts:-0.482000
|
||||
ret: 0 st: 0 flags:1 dts: 0.011000 pts: 0.011000 pos: 1019 size: 27837
|
||||
ret: 0 st: 0 flags:1 dts: 0.011000 pts: 0.011000 pos: 930 size: 27837
|
||||
ret: 0 st: 0 flags:1 ts: 2.413000
|
||||
ret: 0 st: 0 flags:1 dts: 0.971000 pts: 0.971000 pos: 292435 size: 27834
|
||||
ret: 0 st: 0 flags:1 dts: 0.971000 pts: 0.971000 pos: 292346 size: 27834
|
||||
ret:-1 st: 1 flags:0 ts: 1.307000
|
||||
ret: 0 st: 1 flags:1 ts: 0.201000
|
||||
ret: 0 st: 1 flags:1 dts: 0.000000 pts: 0.000000 pos: 803 size: 208
|
||||
ret: 0 st: 1 flags:1 dts: 0.000000 pts: 0.000000 pos: 714 size: 208
|
||||
ret: 0 st:-1 flags:0 ts:-0.904994
|
||||
ret: 0 st: 0 flags:1 dts: 0.011000 pts: 0.011000 pos: 1019 size: 27837
|
||||
ret: 0 st: 0 flags:1 dts: 0.011000 pts: 0.011000 pos: 930 size: 27837
|
||||
ret: 0 st:-1 flags:1 ts: 1.989173
|
||||
ret: 0 st: 0 flags:1 dts: 0.971000 pts: 0.971000 pos: 292435 size: 27834
|
||||
ret: 0 st: 0 flags:1 dts: 0.971000 pts: 0.971000 pos: 292346 size: 27834
|
||||
ret: 0 st: 0 flags:0 ts: 0.883000
|
||||
ret: 0 st: 0 flags:1 dts: 0.971000 pts: 0.971000 pos: 292435 size: 27834
|
||||
ret: 0 st: 0 flags:1 dts: 0.971000 pts: 0.971000 pos: 292346 size: 27834
|
||||
ret: 0 st: 0 flags:1 ts:-0.222000
|
||||
ret: 0 st: 0 flags:1 dts: 0.011000 pts: 0.011000 pos: 1019 size: 27837
|
||||
ret: 0 st: 0 flags:1 dts: 0.011000 pts: 0.011000 pos: 930 size: 27837
|
||||
ret:-1 st: 1 flags:0 ts: 2.672000
|
||||
ret: 0 st: 1 flags:1 ts: 1.566000
|
||||
ret: 0 st: 1 flags:1 dts: 0.993000 pts: 0.993000 pos: 320276 size: 209
|
||||
ret: 0 st: 1 flags:1 dts: 0.993000 pts: 0.993000 pos: 320187 size: 209
|
||||
ret: 0 st:-1 flags:0 ts: 0.460008
|
||||
ret: 0 st: 0 flags:1 dts: 0.491000 pts: 0.491000 pos: 146987 size: 27925
|
||||
ret: 0 st: 0 flags:1 dts: 0.491000 pts: 0.491000 pos: 146898 size: 27925
|
||||
ret: 0 st:-1 flags:1 ts:-0.645825
|
||||
ret: 0 st: 0 flags:1 dts: 0.011000 pts: 0.011000 pos: 1019 size: 27837
|
||||
ret: 0 st: 0 flags:1 dts: 0.011000 pts: 0.011000 pos: 930 size: 27837
|
||||
|
||||
Loading…
Reference in New Issue
Block a user