Just pass through the bitstream as is. This is the same as what is done
for HEVC already.
---
libavcodec/h264_mp4toannexb_bsf.c | 7 ++++++-
1 file changed, 6 insertions(+), 1 deletion(-)
diff --git a/libavcodec/h264_mp4toannexb_bsf.c
b/libavcodec/h264_mp4toannexb_bsf.c
index c1e2a28..0446790 100644
--- a/libavcodec/h264_mp4toannexb_bsf.c
+++ b/libavcodec/h264_mp4toannexb_bsf.c
@@ -134,7 +134,12 @@ static int h264_mp4toannexb_init(AVBSFContext *ctx)
int ret;
/* retrieve sps and pps NAL units from extradata */
- if (ctx->par_in->extradata_size >= 6) {
+ if (ctx->par_in->extradata_size < 6 ||
+ AV_RB24(ctx->par_in->extradata) == 1 ||
+ AV_RB32(ctx->par_in->extradata) == 1) {
+ av_log(ctx, AV_LOG_VERBOSE,
+ "The input looks like it is Annex B already\n");
+ } else {
ret = h264_extradata_to_annexb(ctx, AV_INPUT_BUFFER_PADDING_SIZE);
if (ret < 0)
return ret;
--
2.0.0
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