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Code Issues Releases Activity

avcodec/bsf/h264_mp4toannexb: Fix mixed bitstream format

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This bsf converts AV_PKT_DATA_NEW_EXTRADATA side data in avcc format
to in-band annexb format. However, the side data wasn't been removed
and copied from input packet to output packet. So the output packet
has mixed bitstream format. We don't support mixed bitstream format.
For example, h264_metadata report error in the following case:

ffmpeg -i foo.flv \
  -bsf:v "h264_mp4toannexb,h264_metadata" \
  -c copy -f null

This patch removed NEW_EXTRADATA side data after process.

This patch also add a check so only NEW_EXTRADATA in avcc format is
processed. NEW_EXTRADATA in annexb format is copied to output as is.

Reported-by: jiangjie <jiangjie618@gmail.com>
Signed-off-by: Zhao Zhili <zhilizhao@tencent.com>
This commit is contained in:
Zhao Zhili
2025-04-25 01:08:36 +08:00
parent 26752368f0
commit 25812d3033
2 changed files with 14 additions and 12 deletions
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18
libavcodec/bsf/h264_mp4toannexb.c
View File

@ -93,6 +93,11 @@ static int h264_extradata_to_annexb(AVBSFContext *ctx,
const int padding = AV_INPUT_BUFFER_PADDING_SIZE;
int length_size, pps_offset = 0;
if (extradata_size < 7) {
av_log(ctx, AV_LOG_ERROR, "Invalid extradata size: %d\n", extradata_size);
return AVERROR_INVALIDDATA;
}
bytestream2_init(gb, extradata, extradata_size);
bytestream2_skipu(gb, 4);
@ -262,16 +267,11 @@ static int h264_mp4toannexb_init(AVBSFContext *ctx)
(extra_size >= 4 && AV_RB32(ctx->par_in->extradata) == 1)) {
av_log(ctx, AV_LOG_VERBOSE,
"The input looks like it is Annex B already\n");
} else if (extra_size >= 7) {
return 0;
}
return h264_extradata_to_annexb(ctx,
ctx->par_in->extradata,
ctx->par_in->extradata_size);
} else {
av_log(ctx, AV_LOG_ERROR, "Invalid extradata size: %d\n", extra_size);
return AVERROR_INVALIDDATA;
}
return 0;
}
static int h264_mp4toannexb_filter(AVBSFContext *ctx, AVPacket *opkt)
@ -293,10 +293,12 @@ static int h264_mp4toannexb_filter(AVBSFContext *ctx, AVPacket *opkt)
extradata = av_packet_get_side_data(in, AV_PKT_DATA_NEW_EXTRADATA,
&extradata_size);
if (extradata) {
if (extradata && extradata[0] == 1) {
ret = h264_extradata_to_annexb(ctx, extradata, extradata_size);
if (ret < 0)
goto fail;
av_packet_side_data_remove(in->side_data, &in->side_data_elems,
AV_PKT_DATA_NEW_EXTRADATA);
}
/* nothing to filter */

4
tests/fate/h264.mak
View File

@ -225,7 +225,7 @@ FATE_H264-$(call FRAMECRC, MOV, H264) += fate-h264-unescaped-extradata
# this sample contains field-coded frames, with both fields in a single packet
FATE_H264-$(call FRAMECRC, MOV, H264) += fate-h264-twofields-packet
FATE_H264-$(call DEMMUX, MOV, H264, H264_MP4TOANNEXB_BSF SCALE_FILTER) += fate-h264-bsf-mp4toannexb-new-extradata
FATE_H264-$(call DEMMUX, MOV, H264, H264_MP4TOANNEXB_BSF H264_METADATA_BSF SCALE_FILTER) += fate-h264-bsf-mp4toannexb-new-extradata
FATE_H264-$(call DEMMUX, MOV, H264, H264_MP4TOANNEXB_BSF) += fate-h264-bsf-mp4toannexb \
fate-h264-bsf-mp4toannexb-2 \
@ -440,7 +440,7 @@ fate-h264-bsf-mp4toannexb: CMD = md5 -i $(TARGET_SAMPLES)
fate-h264-bsf-mp4toannexb-2: CMD = md5 -i $(TARGET_SAMPLES)/h264/ps_prefix_first_idr.mp4 -c:v copy -f h264
fate-h264-bsf-mp4toannexb-2: CMP = oneline
fate-h264-bsf-mp4toannexb-2: REF = cffcfa6a2d0b58c9de1f5785f099f41d
fate-h264-bsf-mp4toannexb-new-extradata: CMD = stream_remux mov $(TARGET_SAMPLES)/h264/extradata-reload-multi-stsd.mov "" h264 "-map 0:v"
fate-h264-bsf-mp4toannexb-new-extradata: CMD = stream_remux mov $(TARGET_SAMPLES)/h264/extradata-reload-multi-stsd.mov "" h264 "-bsf h264_mp4toannexb,h264_metadata -map 0:v"
fate-h264-bsf-dts2pts: CMD = transcode "h264" $(TARGET_SAMPLES)/h264-conformance/CAPAMA3_Sand_F.264 \
mov "-c:v copy -bsf:v dts2pts -frames:v 50" "-c:v copy"
fate-h264_mp4toannexb_ticket5927: CMD = transcode "mp4" $(TARGET_SAMPLES)/h264/thezerotheorem-cut.mp4 \