On 19/04/16 19:40, Anton Khirnov wrote:
> 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;
> 

Sure.
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