[FFmpeg-devel] [PATCH v7 2/3] lavf/isom: support for demuxing and remuxing of MPEG-H 3D Audio in MP4

James Almer jamrial at gmail.com
Thu Dec 12 15:58:18 EET 2019


On 12/12/2019 9:57 AM, Tsuchiya, Yuki (SHES) wrote:
> Hi James,
> 
> ´╗┐On 2019/12/12 21:45, "ffmpeg-devel on behalf of James Almer" <ffmpeg-devel-bounces at ffmpeg.org on behalf of jamrial at gmail.com> wrote:
> 
>     >> diff --git a/libavformat/movenc.c b/libavformat/movenc.c
>     >> index dd144ae20a..8456bfac6d 100644
>     >> --- a/libavformat/movenc.c
>     >> +++ b/libavformat/movenc.c
>     >> @@ -2493,6 +2493,7 @@ static int mov_write_stbl_tag(AVFormatContext *s, AVIOContext *pb, MOVMuxContext
>     >>      mov_write_stts_tag(pb, track);
>     >>      if ((track->par->codec_type == AVMEDIA_TYPE_VIDEO ||
>     >>           track->par->codec_id == AV_CODEC_ID_TRUEHD ||
>     >> +         track->par->codec_id == AV_CODEC_ID_MPEGH_3D_AUDIO ||
>     >
>     > This still depends on packets being flagged as key. One would hope they
>     > were correctly flagged by a parser or demuxer, but there's always a risk
>     > they were not, so if it's possible to do some basic parsing of the
>     > bitstream to look for a sync code or similar, that would be ideal. See
>     > the custom mov_parse_vc1_frame() and mov_parse_truehd_frame() functions
>     > used for this purpose for an example.
>     >
>     > If not possible, then this patch should be ok as is.
>     
> OK. I will contribute the bitstream(mhas) parser like mov_parse_mhas_frame() for adding sync frame information as separate patch.
> In this patch, please proceed as is.

Sounds good. Thanks.


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