[FFmpeg-devel] Add support for 24 bit RTSP audio playback

[Timur Aydin]

Here is a simple test case:

1) Use the live555 RTSP server to serve a 24 bit wav file.

2) Play this file using ffplay as follows:

   $ ffplay rtsp://<ip address>/audio.wav

In this case, ffplay fails as follows:

[ta at bonsai ~]$ ffplay rtsp://10.2.1.21:8554/wave
ffplay version 3.2 Copyright (c) 2003-2016 the FFmpeg developers
   built with gcc 6.2.1 (GCC) 20160830
   configuration: --prefix=/usr --disable-debug --disable-static 
--disable-stripping --enable-avisynth --enable-avresample 
--enable-fontconfig --enable-gmp --enable-gnutls --enable-gpl 
--enable-ladspa --enable-libass --enable-libbluray --enable-libfreetype 
--enable-libfribidi --enable-libgsm --enable-libiec61883 
--enable-libmodplug --enable-libmp3lame --enable-libopencore_amrnb 
--enable-libopencore_amrwb --enable-libopenjpeg --enable-libopus 
--enable-libpulse --enable-libschroedinger --enable-libsoxr 
--enable-libspeex --enable-libssh --enable-libtheora --enable-libv4l2 
--enable-libvidstab --enable-libvorbis --enable-libvpx --enable-libwebp 
--enable-libx264 --enable-libx265 --enable-libxvid --enable-netcdf 
--enable-shared --enable-version3 --enable-x11grab
   libavutil      55. 34.100 / 55. 34.100
   libavcodec     57. 64.100 / 57. 64.100
   libavformat    57. 56.100 / 57. 56.100
   libavdevice    57.  1.100 / 57.  1.100
   libavfilter     6. 65.100 /  6. 65.100
   libavresample   3.  1.  0 /  3.  1.  0
   libswscale      4.  2.100 /  4.  2.100
   libswresample   2.  3.100 /  2.  3.100
   libpostproc    54.  1.100 / 54.  1.100
[rtsp @ 0x7fddbc000920] Could not find codec parameters for stream 0 
(Audio: none, 96000 Hz, 2 channels): unknown codec
Consider increasing the value for the 'analyzeduration' and 'probesize' 
options
Input #0, rtsp, from 'rtsp://10.2.1.21:8554/wave':
   Metadata:
     title           : wave
     comment         : wave
   Duration: 00:10:00.00, start: 0.001250, bitrate: N/A
     Stream #0:0: Audio: none, 96000 Hz, 2 channels
No codec could be found with id 0
Failed to open file 'rtsp://10.2.1.21:8554/wave' or configure filtergraph

-- 
Timur

On 11/5/2016 11:49 AM, Michael Niedermayer wrote:
> On Sat, Nov 05, 2016 at 01:15:44AM +0300, Timur Aydin wrote:
>> Hello guys,
>>
>> When ffplay is used to play from the RTSP URL that serves 24 bit
>> audio content, ffplay fails to recognize the audio codec format. The
>> attached patch adds support for playing 24 bit audio content over
>> RTSP by defining a dynamic payload handler for "L24".
>
> do you have a testcase for this ?
>
> [...]
>
>
>
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