[FFmpeg-user] Regarding how to extracting video from RTPpackets using ffmpeg API or Source code

[chetan goni]

Hi   Moritz,

I have extracted RTP payload from RTP packets containing audio and ran
below command and got the audio file and played in vlc

ffmpeg -f mulaw -ar 8000 -ac 1 -i Audio.bin  output.wav

But when i tried with video same procedure and it is giving error

ffmpeg  -f h263   -i Video.bin   -f flv  out.flv

...........
*Error : *

  libpostproc    55.  2.100 / 55.  2.100
[h263 @ 0000024ff2a3a2c0] Bad picture start code
[h263 @ 0000024ff2a3a2c0] header damaged
[h263 @ 0000024ff2a2f500] decoding for stream 0 failed
[h263 @ 0000024ff2a2f500] Could not find codec parameters for stream 0
(Video: h263, none): unspecified size
Consider increasing the value for the 'analyzeduration' and 'probesize'
options
Input #0, h263, from 'audio.bin':
  Duration: N/A, bitrate: N/A
    Stream #0:0: Video: h263, none, 25 tbr, 1200k tbn, 25 tbc
Stream mapping:
  Stream #0:0 -> #0:0 (h263 (native) -> flv1 (flv))
Press [q] to stop, [?] for help
[h263 @ 0000024ff2a3f140] Bad picture start code
[h263 @ 0000024ff2a3f140] header damaged
Error while decoding stream #0:0: Operation not permitted
Cannot determine format of input stream 0:0 after EOF
Error marking filters as finished
Conversion failed!

Thanks & Regards

Chetan Goni

On Thu, Aug 9, 2018 at 6:01 PM, Moritz Barsnick <barsnick at gmx.net> wrote:

> On Thu, Aug 09, 2018 at 16:24:51 +0530, chetan goni wrote:
> > I have do not have   "rtp://your.proper.url " .I have RTP packets.
> > Do you hav procedure to extract video from RTP
>
> Ah, so you don't actually have an RTP stream, you have a packet dump of
> an RTP stream.
>
> In this thread, someone had that request, and had a PCAP capture of the
> stream. It seems he used "pcapreader" to pipe it to ffmpeg, but also
> provided the SDP file:
> https://lists.ffmpeg.org/pipermail/ffmpeg-user/2017-September/037224.html
>
> If you have a raw packet dump, you can likely use it as input, or pipe
> it directly to ffmpeg.
>
> Alomst successful here, but follow the thread regarding his followup
> about the audio format:
> https://lists.ffmpeg.org/pipermail/ffmpeg-user/2017-September/037296.html
>
> Moritz
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