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new 1b1f602699 avcodec/d3d12va_encode: set extradata for global header
when muxing AV1 to MKV
1b1f602699 is described below
commit 1b1f6026990bd081ec6e2cef8cd88f60ddbfea66
Author: younengxiao <[email protected]>
AuthorDate: Wed Jun 24 13:40:02 2026 -0400
Commit: Tong Wu <[email protected]>
CommitDate: Wed Jul 22 03:18:18 2026 +0000
avcodec/d3d12va_encode: set extradata for global header when muxing AV1 to
MKV
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 <[email protected]>
---
libavcodec/d3d12va_encode.c | 21 +++++++++++++++++++++
1 file changed, 21 insertions(+)
diff --git a/libavcodec/d3d12va_encode.c b/libavcodec/d3d12va_encode.c
index d7125db929..442dbc6a4a 100644
--- a/libavcodec/d3d12va_encode.c
+++ b/libavcodec/d3d12va_encode.c
@@ -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:
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