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fftools/ffmpeg: move some muxing-related code into a separate file

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This is a first step towards making muxers more independent from the
rest of the code.
This commit is contained in:
Anton Khirnov 2021-11-10 14:51:48 +01:00
parent b1a984cb49
commit 288aa37387
4 changed files with 314 additions and 266 deletions
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6
fftools/Makefile
View File

@ -9,7 +9,11 @@ AVBASENAMES = ffmpeg ffplay ffprobe
ALLAVPROGS = $(AVBASENAMES:%=%$(PROGSSUF)$(EXESUF))
ALLAVPROGS_G = $(AVBASENAMES:%=%$(PROGSSUF)_g$(EXESUF))
OBJS-ffmpeg += fftools/ffmpeg_opt.o fftools/ffmpeg_filter.o fftools/ffmpeg_hw.o
OBJS-ffmpeg += \
fftools/ffmpeg_filter.o \
fftools/ffmpeg_hw.o \
fftools/ffmpeg_mux.o \
fftools/ffmpeg_opt.o \
define DOFFTOOL
OBJS-$(1) += fftools/cmdutils.o fftools/opt_common.o fftools/$(1).o $(OBJS-$(1)-yes)

272
fftools/ffmpeg.c
View File

@ -137,9 +137,9 @@ static int nb_frames_dup = 0;
static unsigned dup_warning = 1000;
static int nb_frames_drop = 0;
static int64_t decode_error_stat[2];
static unsigned nb_output_dumped = 0;
unsigned nb_output_dumped = 0;
static int want_sdp = 1;
int want_sdp = 1;
static BenchmarkTimeStamps current_time;
AVIOContext *progress_avio = NULL;
@ -345,7 +345,7 @@ static volatile int received_sigterm = 0;
static volatile int received_nb_signals = 0;
static atomic_int transcode_init_done = ATOMIC_VAR_INIT(0);
static volatile int ffmpeg_exited = 0;
static int main_return_code = 0;
int main_return_code = 0;
static int64_t copy_ts_first_pts = AV_NOPTS_VALUE;
static void
@ -711,159 +711,6 @@ static void update_benchmark(const char *fmt, ...)
}
}
static void close_all_output_streams(OutputStream *ost, OSTFinished this_stream, OSTFinished others)
{
int i;
for (i = 0; i < nb_output_streams; i++) {
OutputStream *ost2 = output_streams[i];
ost2->finished |= ost == ost2 ? this_stream : others;
}
}
static void write_packet(OutputFile *of, AVPacket *pkt, OutputStream *ost, int unqueue)
{
AVFormatContext *s = of->ctx;
AVStream *st = ost->st;
int ret;
/*
* Audio encoders may split the packets -- #frames in != #packets out.
* But there is no reordering, so we can limit the number of output packets
* by simply dropping them here.
* Counting encoded video frames needs to be done separately because of
* reordering, see do_video_out().
* Do not count the packet when unqueued because it has been counted when queued.
*/
if (!(st->codecpar->codec_type == AVMEDIA_TYPE_VIDEO && ost->encoding_needed) && !unqueue) {
if (ost->frame_number >= ost->max_frames) {
av_packet_unref(pkt);
return;
}
ost->frame_number++;
}
if (!of->header_written) {
AVPacket *tmp_pkt;
/* the muxer is not initialized yet, buffer the packet */
if (!av_fifo_can_write(ost->muxing_queue)) {
size_t cur_size = av_fifo_can_read(ost->muxing_queue);
unsigned int are_we_over_size =
(ost->muxing_queue_data_size + pkt->size) > ost->muxing_queue_data_threshold;
size_t limit = are_we_over_size ? ost->max_muxing_queue_size : SIZE_MAX;
size_t new_size = FFMIN(2 * cur_size, limit);
if (new_size <= cur_size) {
av_log(NULL, AV_LOG_ERROR,
"Too many packets buffered for output stream %d:%d.\n",
ost->file_index, ost->st->index);
exit_program(1);
}
ret = av_fifo_grow2(ost->muxing_queue, new_size - cur_size);
if (ret < 0)
exit_program(1);
}
ret = av_packet_make_refcounted(pkt);
if (ret < 0)
exit_program(1);
tmp_pkt = av_packet_alloc();
if (!tmp_pkt)
exit_program(1);
av_packet_move_ref(tmp_pkt, pkt);
ost->muxing_queue_data_size += tmp_pkt->size;
av_fifo_write(ost->muxing_queue, &tmp_pkt, 1);
return;
}
if ((st->codecpar->codec_type == AVMEDIA_TYPE_VIDEO && video_sync_method == VSYNC_DROP) ||
(st->codecpar->codec_type == AVMEDIA_TYPE_AUDIO && audio_sync_method < 0))
pkt->pts = pkt->dts = AV_NOPTS_VALUE;
if (st->codecpar->codec_type == AVMEDIA_TYPE_VIDEO) {
int i;
uint8_t *sd = av_packet_get_side_data(pkt, AV_PKT_DATA_QUALITY_STATS,
NULL);
ost->quality = sd ? AV_RL32(sd) : -1;
ost->pict_type = sd ? sd[4] : AV_PICTURE_TYPE_NONE;
for (i = 0; i<FF_ARRAY_ELEMS(ost->error); i++) {
if (sd && i < sd[5])
ost->error[i] = AV_RL64(sd + 8 + 8*i);
else
ost->error[i] = -1;
}
if (ost->frame_rate.num && ost->is_cfr) {
if (pkt->duration > 0)
av_log(NULL, AV_LOG_WARNING, "Overriding packet duration by frame rate, this should not happen\n");
pkt->duration = av_rescale_q(1, av_inv_q(ost->frame_rate),
ost->mux_timebase);
}
}
av_packet_rescale_ts(pkt, ost->mux_timebase, ost->st->time_base);
if (!(s->oformat->flags & AVFMT_NOTIMESTAMPS)) {
if (pkt->dts != AV_NOPTS_VALUE &&
pkt->pts != AV_NOPTS_VALUE &&
pkt->dts > pkt->pts) {
av_log(s, AV_LOG_WARNING, "Invalid DTS: %"PRId64" PTS: %"PRId64" in output stream %d:%d, replacing by guess\n",
pkt->dts, pkt->pts,
ost->file_index, ost->st->index);
pkt->pts =
pkt->dts = pkt->pts + pkt->dts + ost->last_mux_dts + 1
- FFMIN3(pkt->pts, pkt->dts, ost->last_mux_dts + 1)
- FFMAX3(pkt->pts, pkt->dts, ost->last_mux_dts + 1);
}
if ((st->codecpar->codec_type == AVMEDIA_TYPE_AUDIO || st->codecpar->codec_type == AVMEDIA_TYPE_VIDEO || st->codecpar->codec_type == AVMEDIA_TYPE_SUBTITLE) &&
pkt->dts != AV_NOPTS_VALUE &&
ost->last_mux_dts != AV_NOPTS_VALUE) {
int64_t max = ost->last_mux_dts + !(s->oformat->flags & AVFMT_TS_NONSTRICT);
if (pkt->dts < max) {
int loglevel = max - pkt->dts > 2 || st->codecpar->codec_type == AVMEDIA_TYPE_VIDEO ? AV_LOG_WARNING : AV_LOG_DEBUG;
if (exit_on_error)
loglevel = AV_LOG_ERROR;
av_log(s, loglevel, "Non-monotonous DTS in output stream "
"%d:%d; previous: %"PRId64", current: %"PRId64"; ",
ost->file_index, ost->st->index, ost->last_mux_dts, pkt->dts);
if (exit_on_error) {
av_log(NULL, AV_LOG_FATAL, "aborting.\n");
exit_program(1);
}
av_log(s, loglevel, "changing to %"PRId64". This may result "
"in incorrect timestamps in the output file.\n",
max);
if (pkt->pts >= pkt->dts)
pkt->pts = FFMAX(pkt->pts, max);
pkt->dts = max;
}
}
}
ost->last_mux_dts = pkt->dts;
ost->data_size += pkt->size;
ost->packets_written++;
pkt->stream_index = ost->index;
if (debug_ts) {
av_log(NULL, AV_LOG_INFO, "muxer <- type:%s "
"pkt_pts:%s pkt_pts_time:%s pkt_dts:%s pkt_dts_time:%s duration:%s duration_time:%s size:%d\n",
av_get_media_type_string(ost->enc_ctx->codec_type),
av_ts2str(pkt->pts), av_ts2timestr(pkt->pts, &ost->st->time_base),
av_ts2str(pkt->dts), av_ts2timestr(pkt->dts, &ost->st->time_base),
av_ts2str(pkt->duration), av_ts2timestr(pkt->duration, &ost->st->time_base),
pkt->size
);
}
ret = av_interleaved_write_frame(s, pkt);
if (ret < 0) {
print_error("av_interleaved_write_frame()", ret);
main_return_code = 1;
close_all_output_streams(ost, MUXER_FINISHED | ENCODER_FINISHED, ENCODER_FINISHED);
}
}
static void close_output_stream(OutputStream *ost)
{
OutputFile *of = output_files[ost->file_index];
@ -898,11 +745,11 @@ static void output_packet(OutputFile *of, AVPacket *pkt,
if (ret < 0)
goto finish;
while ((ret = av_bsf_receive_packet(ost->bsf_ctx, pkt)) >= 0)
write_packet(of, pkt, ost, 0);
of_write_packet(of, pkt, ost, 0);
if (ret == AVERROR(EAGAIN))
ret = 0;
} else if (!eof)
write_packet(of, pkt, ost, 0);
of_write_packet(of, pkt, ost, 0);
finish:
if (ret < 0 && ret != AVERROR_EOF) {
@ -2767,59 +2614,6 @@ static int process_input_packet(InputStream *ist, const AVPacket *pkt, int no_eo
return !eof_reached;
}
static int print_sdp(void)
{
char sdp[16384];
int i;
int j, ret;
AVIOContext *sdp_pb;
AVFormatContext **avc;
for (i = 0; i < nb_output_files; i++) {
if (!output_files[i]->header_written)
return 0;
}
avc = av_malloc_array(nb_output_files, sizeof(*avc));
if (!avc)
exit_program(1);
for (i = 0, j = 0; i < nb_output_files; i++) {
if (!strcmp(output_files[i]->ctx->oformat->name, "rtp")) {
avc[j] = output_files[i]->ctx;
j++;
}
}
if (!j) {
av_log(NULL, AV_LOG_ERROR, "No output streams in the SDP.\n");
ret = AVERROR(EINVAL);
goto fail;
}
ret = av_sdp_create(avc, j, sdp, sizeof(sdp));
if (ret < 0)
goto fail;
if (!sdp_filename) {
printf("SDP:\n%s\n", sdp);
fflush(stdout);
} else {
ret = avio_open2(&sdp_pb, sdp_filename, AVIO_FLAG_WRITE, &int_cb, NULL);
if (ret < 0) {
av_log(NULL, AV_LOG_ERROR, "Failed to open sdp file '%s'\n", sdp_filename);
goto fail;
}
avio_print(sdp_pb, sdp);
avio_closep(&sdp_pb);
av_freep(&sdp_filename);
}
fail:
av_freep(&avc);
return ret;
}
static enum AVPixelFormat get_format(AVCodecContext *s, const enum AVPixelFormat *pix_fmts)
{
InputStream *ist = s->opaque;
@ -2946,58 +2740,6 @@ static int compare_int64(const void *a, const void *b)
return FFDIFFSIGN(*(const int64_t *)a, *(const int64_t *)b);
}
/* open the muxer when all the streams are initialized */
static int check_init_output_file(OutputFile *of)
{
int ret, i;
for (i = 0; i < of->ctx->nb_streams; i++) {
OutputStream *ost = output_streams[of->ost_index + i];
if (!ost->initialized)
return 0;
}
ret = avformat_write_header(of->ctx, &of->opts);
if (ret < 0) {
av_log(NULL, AV_LOG_ERROR,
"Could not write header for output file #%d "
"(incorrect codec parameters ?): %s\n",
of->index, av_err2str(ret));
return ret;
}
//assert_avoptions(of->opts);
of->header_written = 1;
av_dump_format(of->ctx, of->index, of->ctx->url, 1);
nb_output_dumped++;
if (sdp_filename || want_sdp) {
ret = print_sdp();
if (ret < 0) {
av_log(NULL, AV_LOG_ERROR, "Error writing the SDP.\n");
return ret;
}
}
/* flush the muxing queues */
for (i = 0; i < of->ctx->nb_streams; i++) {
OutputStream *ost = output_streams[of->ost_index + i];
AVPacket *pkt;
/* try to improve muxing time_base (only possible if nothing has been written yet) */
if (!av_fifo_can_read(ost->muxing_queue))
ost->mux_timebase = ost->st->time_base;
while (av_fifo_read(ost->muxing_queue, &pkt, 1) >= 0) {
ost->muxing_queue_data_size -= pkt->size;
write_packet(of, pkt, ost, 1);
av_packet_free(&pkt);
}
}
return 0;
}
static int init_output_bsfs(OutputStream *ost)
{
AVBSFContext *ctx = ost->bsf_ctx;
@ -3571,7 +3313,7 @@ static int init_output_stream(OutputStream *ost, AVFrame *frame,
ost->initialized = 1;
ret = check_init_output_file(output_files[ost->file_index]);
ret = of_check_init(output_files[ost->file_index]);
if (ret < 0)
return ret;
@ -3674,7 +3416,7 @@ static int transcode_init(void)
for (i = 0; i < nb_output_files; i++) {
oc = output_files[i]->ctx;
if (oc->oformat->flags & AVFMT_NOSTREAMS && oc->nb_streams == 0) {
ret = check_init_output_file(output_files[i]);
ret = of_check_init(output_files[i]);
if (ret < 0)
goto dump_format;
}

10
fftools/ffmpeg.h
View File

@ -647,6 +647,10 @@ extern char *qsv_device;
#endif
extern HWDevice *filter_hw_device;
extern int want_sdp;
extern unsigned nb_output_dumped;
extern int main_return_code;
void term_init(void);
void term_exit(void);
@ -683,4 +687,10 @@ int hw_device_setup_for_filter(FilterGraph *fg);
int hwaccel_decode_init(AVCodecContext *avctx);
/* open the muxer when all the streams are initialized */
int of_check_init(OutputFile *of);
void of_write_packet(OutputFile *of, AVPacket *pkt, OutputStream *ost,
int unqueue);
#endif /* FFTOOLS_FFMPEG_H */

292
fftools/ffmpeg_mux.c Normal file
View File

@ -0,0 +1,292 @@
/*
* This file is part of FFmpeg.
*
* FFmpeg is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* FFmpeg is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with FFmpeg; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include <stdio.h>
#include <string.h>
#include "ffmpeg.h"
#include "libavutil/fifo.h"
#include "libavutil/intreadwrite.h"
#include "libavutil/log.h"
#include "libavutil/mem.h"
#include "libavutil/timestamp.h"
#include "libavcodec/packet.h"
#include "libavformat/avformat.h"
#include "libavformat/avio.h"
static void close_all_output_streams(OutputStream *ost, OSTFinished this_stream, OSTFinished others)
{
int i;
for (i = 0; i < nb_output_streams; i++) {
OutputStream *ost2 = output_streams[i];
ost2->finished |= ost == ost2 ? this_stream : others;
}
}
void of_write_packet(OutputFile *of, AVPacket *pkt, OutputStream *ost,
int unqueue)
{
AVFormatContext *s = of->ctx;
AVStream *st = ost->st;
int ret;
/*
* Audio encoders may split the packets -- #frames in != #packets out.
* But there is no reordering, so we can limit the number of output packets
* by simply dropping them here.
* Counting encoded video frames needs to be done separately because of
* reordering, see do_video_out().
* Do not count the packet when unqueued because it has been counted when queued.
*/
if (!(st->codecpar->codec_type == AVMEDIA_TYPE_VIDEO && ost->encoding_needed) && !unqueue) {
if (ost->frame_number >= ost->max_frames) {
av_packet_unref(pkt);
return;
}
ost->frame_number++;
}
if (!of->header_written) {
AVPacket *tmp_pkt;
/* the muxer is not initialized yet, buffer the packet */
if (!av_fifo_can_write(ost->muxing_queue)) {
size_t cur_size = av_fifo_can_read(ost->muxing_queue);
unsigned int are_we_over_size =
(ost->muxing_queue_data_size + pkt->size) > ost->muxing_queue_data_threshold;
size_t limit = are_we_over_size ? ost->max_muxing_queue_size : SIZE_MAX;
size_t new_size = FFMIN(2 * cur_size, limit);
if (new_size <= cur_size) {
av_log(NULL, AV_LOG_ERROR,
"Too many packets buffered for output stream %d:%d.\n",
ost->file_index, ost->st->index);
exit_program(1);
}
ret = av_fifo_grow2(ost->muxing_queue, new_size - cur_size);
if (ret < 0)
exit_program(1);
}
ret = av_packet_make_refcounted(pkt);
if (ret < 0)
exit_program(1);
tmp_pkt = av_packet_alloc();
if (!tmp_pkt)
exit_program(1);
av_packet_move_ref(tmp_pkt, pkt);
ost->muxing_queue_data_size += tmp_pkt->size;
av_fifo_write(ost->muxing_queue, &tmp_pkt, 1);
return;
}
if ((st->codecpar->codec_type == AVMEDIA_TYPE_VIDEO && video_sync_method == VSYNC_DROP) ||
(st->codecpar->codec_type == AVMEDIA_TYPE_AUDIO && audio_sync_method < 0))
pkt->pts = pkt->dts = AV_NOPTS_VALUE;
if (st->codecpar->codec_type == AVMEDIA_TYPE_VIDEO) {
int i;
uint8_t *sd = av_packet_get_side_data(pkt, AV_PKT_DATA_QUALITY_STATS,
NULL);
ost->quality = sd ? AV_RL32(sd) : -1;
ost->pict_type = sd ? sd[4] : AV_PICTURE_TYPE_NONE;
for (i = 0; i<FF_ARRAY_ELEMS(ost->error); i++) {
if (sd && i < sd[5])
ost->error[i] = AV_RL64(sd + 8 + 8*i);
else
ost->error[i] = -1;
}
if (ost->frame_rate.num && ost->is_cfr) {
if (pkt->duration > 0)
av_log(NULL, AV_LOG_WARNING, "Overriding packet duration by frame rate, this should not happen\n");
pkt->duration = av_rescale_q(1, av_inv_q(ost->frame_rate),
ost->mux_timebase);
}
}
av_packet_rescale_ts(pkt, ost->mux_timebase, ost->st->time_base);
if (!(s->oformat->flags & AVFMT_NOTIMESTAMPS)) {
if (pkt->dts != AV_NOPTS_VALUE &&
pkt->pts != AV_NOPTS_VALUE &&
pkt->dts > pkt->pts) {
av_log(s, AV_LOG_WARNING, "Invalid DTS: %"PRId64" PTS: %"PRId64" in output stream %d:%d, replacing by guess\n",
pkt->dts, pkt->pts,
ost->file_index, ost->st->index);
pkt->pts =
pkt->dts = pkt->pts + pkt->dts + ost->last_mux_dts + 1
- FFMIN3(pkt->pts, pkt->dts, ost->last_mux_dts + 1)
- FFMAX3(pkt->pts, pkt->dts, ost->last_mux_dts + 1);
}
if ((st->codecpar->codec_type == AVMEDIA_TYPE_AUDIO || st->codecpar->codec_type == AVMEDIA_TYPE_VIDEO || st->codecpar->codec_type == AVMEDIA_TYPE_SUBTITLE) &&
pkt->dts != AV_NOPTS_VALUE &&
ost->last_mux_dts != AV_NOPTS_VALUE) {
int64_t max = ost->last_mux_dts + !(s->oformat->flags & AVFMT_TS_NONSTRICT);
if (pkt->dts < max) {
int loglevel = max - pkt->dts > 2 || st->codecpar->codec_type == AVMEDIA_TYPE_VIDEO ? AV_LOG_WARNING : AV_LOG_DEBUG;
if (exit_on_error)
loglevel = AV_LOG_ERROR;
av_log(s, loglevel, "Non-monotonous DTS in output stream "
"%d:%d; previous: %"PRId64", current: %"PRId64"; ",
ost->file_index, ost->st->index, ost->last_mux_dts, pkt->dts);
if (exit_on_error) {
av_log(NULL, AV_LOG_FATAL, "aborting.\n");
exit_program(1);
}
av_log(s, loglevel, "changing to %"PRId64". This may result "
"in incorrect timestamps in the output file.\n",
max);
if (pkt->pts >= pkt->dts)
pkt->pts = FFMAX(pkt->pts, max);
pkt->dts = max;
}
}
}
ost->last_mux_dts = pkt->dts;
ost->data_size += pkt->size;
ost->packets_written++;
pkt->stream_index = ost->index;
if (debug_ts) {
av_log(NULL, AV_LOG_INFO, "muxer <- type:%s "
"pkt_pts:%s pkt_pts_time:%s pkt_dts:%s pkt_dts_time:%s duration:%s duration_time:%s size:%d\n",
av_get_media_type_string(ost->enc_ctx->codec_type),
av_ts2str(pkt->pts), av_ts2timestr(pkt->pts, &ost->st->time_base),
av_ts2str(pkt->dts), av_ts2timestr(pkt->dts, &ost->st->time_base),
av_ts2str(pkt->duration), av_ts2timestr(pkt->duration, &ost->st->time_base),
pkt->size
);
}
ret = av_interleaved_write_frame(s, pkt);
if (ret < 0) {
print_error("av_interleaved_write_frame()", ret);
main_return_code = 1;
close_all_output_streams(ost, MUXER_FINISHED | ENCODER_FINISHED, ENCODER_FINISHED);
}
}
static int print_sdp(void)
{
char sdp[16384];
int i;
int j, ret;
AVIOContext *sdp_pb;
AVFormatContext **avc;
for (i = 0; i < nb_output_files; i++) {
if (!output_files[i]->header_written)
return 0;
}
avc = av_malloc_array(nb_output_files, sizeof(*avc));
if (!avc)
exit_program(1);
for (i = 0, j = 0; i < nb_output_files; i++) {
if (!strcmp(output_files[i]->ctx->oformat->name, "rtp")) {
avc[j] = output_files[i]->ctx;
j++;
}
}
if (!j) {
av_log(NULL, AV_LOG_ERROR, "No output streams in the SDP.\n");
ret = AVERROR(EINVAL);
goto fail;
}
ret = av_sdp_create(avc, j, sdp, sizeof(sdp));
if (ret < 0)
goto fail;
if (!sdp_filename) {
printf("SDP:\n%s\n", sdp);
fflush(stdout);
} else {
ret = avio_open2(&sdp_pb, sdp_filename, AVIO_FLAG_WRITE, &int_cb, NULL);
if (ret < 0) {
av_log(NULL, AV_LOG_ERROR, "Failed to open sdp file '%s'\n", sdp_filename);
goto fail;
}
avio_print(sdp_pb, sdp);
avio_closep(&sdp_pb);
av_freep(&sdp_filename);
}
fail:
av_freep(&avc);
return ret;
}
/* open the muxer when all the streams are initialized */
int of_check_init(OutputFile *of)
{
int ret, i;
for (i = 0; i < of->ctx->nb_streams; i++) {
OutputStream *ost = output_streams[of->ost_index + i];
if (!ost->initialized)
return 0;
}
ret = avformat_write_header(of->ctx, &of->opts);
if (ret < 0) {
av_log(NULL, AV_LOG_ERROR,
"Could not write header for output file #%d "
"(incorrect codec parameters ?): %s\n",
of->index, av_err2str(ret));
return ret;
}
//assert_avoptions(of->opts);
of->header_written = 1;
av_dump_format(of->ctx, of->index, of->ctx->url, 1);
nb_output_dumped++;
if (sdp_filename || want_sdp) {
ret = print_sdp();
if (ret < 0) {
av_log(NULL, AV_LOG_ERROR, "Error writing the SDP.\n");
return ret;
}
}
/* flush the muxing queues */
for (i = 0; i < of->ctx->nb_streams; i++) {
OutputStream *ost = output_streams[of->ost_index + i];
AVPacket *pkt;
/* try to improve muxing time_base (only possible if nothing has been written yet) */
if (!av_fifo_can_read(ost->muxing_queue))
ost->mux_timebase = ost->st->time_base;
while (av_fifo_read(ost->muxing_queue, &pkt, 1) >= 0) {
ost->muxing_queue_data_size -= pkt->size;
of_write_packet(of, pkt, ost, 1);
av_packet_free(&pkt);
}
}
return 0;
}