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avcodec/bsf/setts: rescale TS when changing TB

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The setts bsf has an option to change TB. However the filter only
changed the TB and did not rescale the ts and duration, so it
effectively and silently stretched or squeezed the stream.

The pts, dts and duration are now rescaled to maintain temporal fidelity.
This commit is contained in:
Gyan Doshi
2026-01-11 16:48:32 +05:30
parent 6972b127de
commit 1ccd2f6243
1 changed files with 13 additions and 1 deletions
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libavcodec/bsf/setts.c
+13 -1
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@@ -88,6 +88,7 @@ typedef struct SetTSContext {
char *duration_str;
AVRational time_base;
int user_outtb;
int64_t frame_number;
@@ -142,8 +143,13 @@ static int setts_init(AVBSFContext *ctx)
}
}
if (s->time_base.num > 0 && s->time_base.den > 0)
if (s->time_base.num > 0 && s->time_base.den > 0) {
ctx->time_base_out = s->time_base;
s->user_outtb = 1;
} else if (s->time_base.num || !s->time_base.den) {
av_log(ctx, AV_LOG_ERROR, "Invalid value %d/%d specified for output timebase\n", s->time_base.num, s->time_base.den);
return AVERROR_INVALIDDATA;
}
s->frame_number= 0;
s->var_values[VAR_STARTPTS] = AV_NOPTS_VALUE;
@@ -219,6 +225,12 @@ static int setts_filter(AVBSFContext *ctx, AVPacket *pkt)
if (ret < 0)
return ret;
if (s->user_outtb) {
new_pts = av_rescale_q(new_pts, ctx->time_base_in, ctx->time_base_out);
new_dts = av_rescale_q(new_dts, ctx->time_base_in, ctx->time_base_out);
new_duration = av_rescale_q(new_duration, ctx->time_base_in, ctx->time_base_out);
}
pkt->pts = new_pts;
pkt->dts = new_dts;
pkt->duration = new_duration;