From: Jack Lau <jacklau122...@gmail.com>
The `dec_ctx->time_base` was incorrectly default set by avcodec_open2(), while
`enc_ctx->time_base` was derived from `dec_ctx->framerate`. This mismatch could
cause incorrect video duration in the output.
This patch corrects the issue by adjusting the `enc_ctx->time_base` calculation
to account for `ticks_per_frame`, ensuring that the time base is consistent
between the decoder and encoder contexts.
---
doc/examples/transcoding.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/doc/examples/transcoding.c b/doc/examples/transcoding.c
index 013f89fc7d..09c2ad4b62 100644
--- a/doc/examples/transcoding.c
+++ b/doc/examples/transcoding.c
@@ -172,7 +172,7 @@ static int open_output_file(const char *filename)
else
enc_ctx->pix_fmt = dec_ctx->pix_fmt;
/* video time_base can be set to whatever is handy and
supported by encoder */
- enc_ctx->time_base = av_inv_q(dec_ctx->framerate);
+ enc_ctx->time_base = av_inv_q(av_mul_q(dec_ctx->framerate,
(AVRational){dec_ctx->ticks_per_frame, 1}));
} else {
enc_ctx->sample_rate = dec_ctx->sample_rate;
ret = av_channel_layout_copy(&enc_ctx->ch_layout,
&dec_ctx->ch_layout);
@@ -180,7 +180,7 @@ static int open_output_file(const char *filename)
return ret;
/* take first format from list of supported formats */
enc_ctx->sample_fmt = encoder->sample_fmts[0];
- enc_ctx->time_base = (AVRational){1, enc_ctx->sample_rate};
+ enc_ctx->time_base = (AVRational){1, dec_ctx->sample_rate};
}
if (ofmt_ctx->oformat->flags & AVFMT_GLOBALHEADER)
--
2.48.1
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