Hello James,
On 2019/12/10 22:30, "James Almer" <jamr...@gmail.com> wrote:
>> diff --git a/libavformat/utils.c b/libavformat/utils.c
>> index 8196442dd1..70f9e23d8c 100644
>> --- a/libavformat/utils.c
>> +++ b/libavformat/utils.c
>> @@ -1021,7 +1021,8 @@ static int is_intra_only(enum AVCodecID id)
>> const AVCodecDescriptor *d = avcodec_descriptor_get(id);
>> if (!d)
>> return 0;
>> - if (d->type == AVMEDIA_TYPE_VIDEO && !(d->props &
AV_CODEC_PROP_INTRA_ONLY))
>> + if ((d->type == AVMEDIA_TYPE_VIDEO && !(d->props &
AV_CODEC_PROP_INTRA_ONLY)) ||
>> + id == AV_CODEC_ID_MPEGH_3D_AUDIO)
>Instead of changing generic code like this to prevent all MPEG-H 3D
>Audio packets from being tagged as key, you should add a custom function
>much like the VC1 and the TrueHD ones called at the end of
>ff_mov_write_packet() to set the MOV_SYNC_SAMPLE flag and increase the
>track->has_keyframes counter where corresponds.
If the modification in the is_intra_only() is removed, all demuxed frames will
be tagged as key frame.
This means that all single frames got from av_read_frame() will be key frame so
it is difficult to start decoding from actual key frame.
I think this modification or something like other method for keeping key frame
information from stss box is required.
Do you have any idea?
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