[Libav-user] Decoding a H.264 stream from TCP

[Jeremy Graham]

I typed in the following command while the drone was streaming data:

jeramboquai at jeramboquai-NV55S:~/Documents$ ffmpeg -i http://192.168.1.1:5555

It immediately output this and then paused, I assume to attempt to 
interpret the stream:

ffmpeg version git-2012-06-20-b2e2287 Copyright (c) 2000-2012 the FFmpeg 
developers
   builjeramboquai at jeramboquai-NV55S:~/Documents$ ffmpeg -i 
http://192.168.1.1:5555
ffmpeg version git-2012-06-20-b2e2287 Copyright (c) 2000-2012 the FFmpeg 
developers
   built on Jun 20 2012 17:25:25 with gcc 4.6.3
   configuration: --enable-gpl --enable-libfaac --enable-libmp3lame 
--enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libtheora 
--enable-libvorbis --enable-libvpx --enable-libx264 --enable-nonfree 
--enable-version3 --enable-x11grab
   libavutil      51. 59.100 / 51. 59.100
   libavcodec     54. 27.100 / 54. 27.100
   libavformat    54.  9.100 / 54.  9.100
   libavdevice    54.  0.100 / 54.  0.100
   libavfilter     2. 82.100 /  2. 82.100
   libswscale      2.  1.100 /  2.  1.100
   libswresample   0. 15.100 /  0. 15.100
   libpostproc    52.  0.100 / 52.  0.100

When I stopped the stream it then output this:

[h264 @ 0xada1260] non-existing PPS referenced
[h264 @ 0xada1260] non-existing PPS 0 referenced
[h264 @ 0xada1260] decode_slice_header error
[h264 @ 0xada1260] no frame!
[h264 @ 0xad993e0] max_analyze_duration 5000000 reached at 5000000
[h264 @ 0xad993e0] Estimating duration from bitrate, this may be inaccurate

...and then after a few seconds, it output this and quit.

Input #0, h264, from 'http://192.168.1.1:5555':
   Duration: N/A, bitrate: N/A
     Stream #0:0: Video: h264 (Baseline), yuv420p, 640x360, 25 fps, 25 
tbr, 1200k tbn, 50 tbc
At least one output file must be specified


It appears that it tried to decode SOMETHING, but couldn't.  So no, it 
apparently didn't work. :(

On 06/22/2012 03:55 AM, Carl Eugen Hoyos wrote:
> Jeremy Graham<jgraham at ...>  writes:
>
>> I am working with the Parrot AR.Drone 2.0.  I don't know if anyone is
>> familiar with that device, but to make a long story short, it transmits
>> video data from an on-board camera via TCP and the video is encoded with
>> H.264.
> Did you try ffmpeg -i http://xxxx ?
> Does it work?
>
> Carl Eugen
>
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