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fftools/ffmpeg_enc: do not set AVStream timebase directly

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Instead, pass the encoder context to of_stream_init() and have the muxer
take the timebase from there. Note that the muxer can currently access
the codec context directly, but that will change in future commits.

This is a step towards decoupling encoders from muxers.
This commit is contained in:
Anton Khirnov 2024-09-10 10:55:28 +02:00
parent 1ebd521a4e
commit 238f439992
4 changed files with 12 additions and 8 deletions
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3
fftools/ffmpeg.h
View File

@ -871,7 +871,8 @@ int enc_loopback(Encoder *enc);
*
* Open the muxer once all the streams have been initialized.
*/
int of_stream_init(OutputFile *of, OutputStream *ost);
int of_stream_init(OutputFile *of, OutputStream *ost,
const AVCodecContext *enc_ctx);
int of_write_trailer(OutputFile *of);
int of_open(const OptionsContext *o, const char *filename, Scheduler *sch);
void of_free(OutputFile **pof);

6
fftools/ffmpeg_enc.c
View File

@ -367,11 +367,7 @@ int enc_open(void *opaque, const AVFrame *frame)
return ret;
}
// copy timebase while removing common factors
if (ost->st->time_base.num <= 0 || ost->st->time_base.den <= 0)
ost->st->time_base = av_add_q(ost->enc_ctx->time_base, (AVRational){0, 1});
ret = of_stream_init(of, ost);
ret = of_stream_init(of, ost, enc_ctx);
if (ret < 0)
return ret;

9
fftools/ffmpeg_mux.c
View File

@ -608,12 +608,19 @@ static int bsf_init(MuxStream *ms)
return 0;
}
int of_stream_init(OutputFile *of, OutputStream *ost)
int of_stream_init(OutputFile *of, OutputStream *ost,
const AVCodecContext *enc_ctx)
{
Muxer *mux = mux_from_of(of);
MuxStream *ms = ms_from_ost(ost);
int ret;
if (enc_ctx) {
// use upstream time base unless it has been overridden previously
if (ost->st->time_base.num <= 0 || ost->st->time_base.den <= 0)
ost->st->time_base = av_add_q(enc_ctx->time_base, (AVRational){0, 1});
}
/* initialize bitstream filters for the output stream
* needs to be done here, because the codec id for streamcopy is not
* known until now */

2
fftools/ffmpeg_mux_init.c
View File

@ -3385,7 +3385,7 @@ int of_open(const OptionsContext *o, const char *filename, Scheduler *sch)
OutputStream *ost = of->streams[i];
if (!ost->enc) {
err = of_stream_init(of, ost);
err = of_stream_init(of, ost, NULL);
if (err < 0)
return err;
}