--- Begin Message ---
From bfd5500a5448ad468d32994816e8a55c0d4a2428 Mon Sep 17 00:00:00 2001
From: Jack Lau <jacklau122...@gmail.com>
Date: Tue, 4 Feb 2025 21:39:20 +0800
Subject: [PATCH] examples/transcoding: Fix time_base handling
X-Unsent: 1
To: ffmpeg-devel@ffmpeg.org
The `dec_ctx->time_base` was incorrectly default set to 0/60, while
`enc_ctx->time_base` was derived from `dec_ctx->framerate`. This mismatch could
cause incorrect video duration in the output.
This patch aligns `enc_ctx->time_base` with `dec_ctx->time_base` to prevent
rescaling issues and ensure correct video duration.
Signed-off-by: JackLau1222 <2366536...@qq.com>
---
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..847bdb7e1a 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 = dec_ctx->time_base;
} 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 = dec_ctx->time_base;
}
if (ofmt_ctx->oformat->flags & AVFMT_GLOBALHEADER)
--
2.45.2
--- End Message ---
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