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doc/examples/transcode: query encoder for supported configs

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avcodec_get_supported_config() is called with dec_ctx (the decoder
context) to query supported pixel formats and sample formats, but
the intent is to configure the encoder. The decoder supported
format list may differ from the encoder, leading to format
negotiation failures or incorrect output.

Pass enc_ctx instead so the actual encoder capabilities are
queried.

Signed-off-by: Jun Zhao <barryjzhao@tencent.com>
This commit is contained in:
Jun Zhao
2026-03-09 08:46:45 +08:00
committed by toots
parent d25d6b991d
commit c29206e456
1 changed files with 2 additions and 2 deletions
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4
doc/examples/transcode.c
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@@ -177,7 +177,7 @@ static int open_output_file(const char *filename)
enc_ctx->width = dec_ctx->width;
enc_ctx->sample_aspect_ratio = dec_ctx->sample_aspect_ratio;
ret = avcodec_get_supported_config(dec_ctx, NULL,
ret = avcodec_get_supported_config(enc_ctx, NULL,
AV_CODEC_CONFIG_PIX_FORMAT, 0,
(const void**)&pix_fmts, NULL);
@@ -195,7 +195,7 @@ static int open_output_file(const char *filename)
if (ret < 0)
return ret;
ret = avcodec_get_supported_config(dec_ctx, NULL,
ret = avcodec_get_supported_config(enc_ctx, NULL,
AV_CODEC_CONFIG_SAMPLE_FORMAT, 0,
(const void**)&sample_fmts, NULL);