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avcodec/d3d12va_encode: set extradata for global header when muxing AV1 to MKV

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When the muxer sets AV_CODEC_FLAG_GLOBAL_HEADER (as MKV does), the codec
must populate avctx->extradata with the sequence header so the muxer can
write the av1C codec private entry. Otherwise, the mkv muxer will return
AVERROR_INVALIDDATA on the first packet (Invalid data found when
processing input).

Example usage:
  # use mkv container:
  ffmpeg -hwaccel d3d12va -hwaccel_output_format d3d12 -i input.mp4 -c:v av1_d3d12va output.mkv

Signed-off-by: younengxiao <steven.xiao@amd.com>
This commit is contained in:
younengxiao
2026-06-24 13:40:02 -04:00
committed by Tong Wu
parent 5d7112c60e
commit 1b1f602699
1 changed files with 21 additions and 0 deletions
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21
libavcodec/d3d12va_encode.c
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@@ -1858,6 +1858,27 @@ int ff_d3d12va_encode_init(AVCodecContext *avctx)
if (!base_ctx->encode_fifo)
return AVERROR(ENOMEM);
if (ctx->codec->write_sequence_header &&
avctx->flags & AV_CODEC_FLAG_GLOBAL_HEADER) {
char header_data[MAX_PARAM_BUFFER_SIZE];
size_t header_bit_len = 8 * sizeof(header_data);
err = ctx->codec->write_sequence_header(avctx, header_data, &header_bit_len);
if (err < 0) {
av_log(avctx, AV_LOG_ERROR, "Failed to write sequence header "
"for global header: %d.\n", err);
goto fail;
}
avctx->extradata_size = (int)((header_bit_len + 7) / 8);
avctx->extradata = av_mallocz(avctx->extradata_size +
AV_INPUT_BUFFER_PADDING_SIZE);
if (!avctx->extradata) {
err = AVERROR(ENOMEM);
goto fail;
}
memcpy(avctx->extradata, header_data, avctx->extradata_size);
}
return 0;
fail: