[Libav-user] Unable to decode H.264 stream received via RTMP

[Alex Cohn]

On Apr 25, 2012 8:27 PM, "Григорий" <grishka93 at gmail.com> wrote:
>
> Alex Cohn <alexcohn at netvision.net.il> писал(а) в своём письме Wed, 25 Apr
2012 17:54:44 +0400:
>
>> On Wed, Apr 25, 2012 at 16:45, Григорий <grishka93 at gmail.com> wrote:
>>>
>>> Andrey Utkin <andrey.krieger.utkin at gmail.com> писал(а) в своём письме
Wed,
>>> 25 Apr 2012 17:29:09 +0400:
>>>
>>>
>>>> 25 апреля 2012 г. 15:52 пользователь Григорий <grishka93 at gmail.com>
>>>> написал:
>>>>>
>>>>>
>>>>> Hi all.
>>>>> I've built libffmpeg for Android and am trying to decode H.264 stream
>>>>> using
>>>>> it. I'm receiving that stream via RTMP connection and passing all
video
>>>>> packets (excluding first byte that contains flags related to RTMP) to
the
>>>>> avcodec_decode_video2 function. With H.263 it works perfectly, but
when I
>>>>> try to use the same code (only with codec ID changed) for H.264, every
>>>>> call
>>>>> to avcodec_decode_video2 returns -1 and nothing gets decoded.
>>>>> Here is the output:
>>>>
>>>>
>>>>
>>>> Do you know libavformat can read and demux RTMP stream by itself?
>>>> Seems like problem in your demuxer, because decoding the frames it
>>>> produces fail.
>>>>
>>>
>>> Yes I know, but I need more than simply receiving and playing, this
will be
>>> a kind of VoIP service. My demuxer seems to work fine - I am able to
>>> successfully decode audio using Speex and video using libavcodec when
it is
>>> encoded into H.263. Only problem is with H.264.
>>
>>
>> Packing of h264 into a stream is not trivial. You may find some
>> curious information at
>>
http://livertmpjavapublisher.blogspot.com/2011/06/h264-avcvideopacket.html
>>
>> Alex
>> _______________________________________________
>> Libav-user mailing list
>> Libav-user at ffmpeg.org
>> http://ffmpeg.org/mailman/listinfo/libav-user
>
>
> Thank you for this link. I've made it to parse the decoder configuration
record, extract SPS, PPS and some other things. I've tried to pass PPS and
SPS to avcodec_decode_video2 but it still returns -1, prints "no frame!"
and does not decode anything else. Prepending 0x00000001 before them or
making AVCDCR as described here
http://stackoverflow.com/questions/3493742/problem-to-decode-h264-video-over-rtp-with-ffmpeg-libavcodecgive
the same result.

H264 decoder expects SPS and PPS to arrive together with the first (IDR)
frame.

Удачи,
Alex
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