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Code Issues Releases Activity

avformat/flvenc: fix timestamp of key frame index

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Firstly, the timestamps generated from framerate are inaccurate for
variable framerate mode.

Secondly, the timestamps always start from zero, while pts/dts can
start from nonzero. FLV demuxer rejects such index with message:
"Found invalid index entries, clearing the index".
This commit is contained in:
Zhao Zhili 2022-07-29 12:43:08 +08:00
parent 30aa0c3f48
commit 693c5be320
2 changed files with 2 additions and 5 deletions
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5
libavformat/flvenc.c
View File

@ -104,7 +104,6 @@ typedef struct FLVContext {
int64_t lastkeyframelocation_offset;
int64_t lastkeyframelocation;
int acurframeindex;
int64_t keyframes_info_offset;
int64_t filepositions_count;
@ -391,7 +390,6 @@ static void write_metadata(AVFormatContext *s, unsigned int ts)
}
if (flv->flags & FLV_ADD_KEYFRAME_INDEX) {
flv->acurframeindex = 0;
flv->keyframe_index_size = 0;
put_amf_string(pb, "hasVideo");
@ -993,8 +991,7 @@ static int flv_write_packet(AVFormatContext *s, AVPacket *pkt)
switch (par->codec_type) {
case AVMEDIA_TYPE_VIDEO:
flv->videosize += (avio_tell(pb) - cur_offset);
flv->lasttimestamp = flv->acurframeindex / flv->framerate;
flv->acurframeindex++;
flv->lasttimestamp = pkt->dts / 1000.0;
if (pkt->flags & AV_PKT_FLAG_KEY) {
double ts = flv->lasttimestamp;
int64_t pos = cur_offset;

2
tests/ref/fate/flv-add_keyframe_index
View File

@ -1,4 +1,4 @@
5f38d76da3ed4a5be06ca604c53666f2 *tests/data/fate/flv-add_keyframe_index.flv
9f3d6de74f3329651a4c515c20cea00f *tests/data/fate/flv-add_keyframe_index.flv
630192 tests/data/fate/flv-add_keyframe_index.flv
#tb 0: 1/1000
#media_type 0: video