[Ffmpeg-devel] cvs regression

[Zoltan NAGY]

Hello!

I'm playing with mp4's from disc, and streams, described by
sdp files, generated by Apple's Darwin Streaming Server.

here are my results:

--> 0.4.8:
./configure --enable-shared --enable-faad
make
make install

playing an mp4, with aac sound inside:
plazma3:~/ffmpeg-0.4.8# ./ffplay -stats ../c770.mp4
header damaged
warning: first frame is no keyframe
Input #0, mov, from '../c770.mp4':
  Duration: 00:00:11.6, bitrate: 2246 kb/s
  Stream #0.0: Video: mpeg4, 640x480, 29.97 fps
  Stream #0.1: Audio: aac, 48000 Hz, stereo
Fatal signal: Segmentation Fault (SDL Parachute Deployed)
Xlib: unexpected async reply (sequence 0x67)!

and then I have to kill the process.

playing an sdp file:
plazma3:~/ffmpeg-0.4.8# ./ffplay -an -stats ../darwin.sdp
RTP: PT=60: bad cseq f20f expected=0001
header damagedA-V:  0.000 aq=    0KB vq=    0KB
warning: first frame is no keyframe
Input #0, sdp, from '../darwin.sdp':
  Duration: N/A, bitrate: N/A
  Stream #0.0: Video: mpeg4, 380x480, 25.00 fps
Title: C:\Program Files\Darwin Streaming Server\Playlists\teszt\teszt.s@
warning: first frame is no keyframe
1121671779.95 A-V:  0.000 aq=    0KB vq=   13KB

works fine.

so, with 0.4.8, there is clearly a problem with aac.
allright, that's an old one, moving on!

--> 0.4.9-pre1:
./configure --enable-shared --enable-faad --enable-gpl
make
make install
playing an mp4, with aac sound inside:
plazma3:~/ffmpeg-0.4.9-pre1# ./ffplay -stats ../c770.mp4
Input #0, mov,mp4,m4a,3gp, from '../c770.mp4':
  Duration: 00:00:11.6, bitrate: 2246 kb/s
  Stream #0.0: Video: mpeg4, 640x480, 29.97 fps
  Stream #0.1: Audio: mpeg4aac, 48000 Hz, stereo
   0.02 A-V: -6.956 aq=    0KB vq= 1083KB    KB

great!
small problem: the video is waaaaaaaaay toooo slow compared to the video

let's see our lovely sdp:
plazma3:~/ffmpeg-0.4.9-pre1# ./ffplay -an -stats ../darwin.sdp
[NULL @ 0xb7e8f008]RTP: PT=60: bad cseq 38ee expected=0001
Input #0, sdp, from '../darwin.sdp': vq=    0KB
  Duration: N/A, bitrate: N/A
  Stream #0.0: Video: mpeg4, 380x480, 25.00 fps
Title: C:\Program Files\Darwin Streaming Server\Playlists\teszt\teszt.s@
   4.07 A-V:  0.000 aq=    0KB vq=    0KB

seems ok, but ffplay's window remains all black..

so 0.4.9-pre1 is a regression compared to 0.4.8 in this way.

let's see cvs as of friday:
cvs -z3 -d:pserver:anonymous at mplayerhq.hu:/cvsroot/ffmpeg co -P ffmpeg
cd ffmpeg
./configure --enable-shared --enable-faad --enable-gpl
make
make instlal
plazma:~# ffplay -stats mp4\ samples/c770.mp4
Input #0, mov,mp4,m4a,3gp,3g2, from 'mp4 samples/c770.mp4':
  Duration: 00:00:11.6, start: 0.000000, bitrate: 2243 kb/s
  Stream #0.0: Video: mpeg4, yuv420p, 640x480, 29.97 fps
  Stream #0.1: Audio: aac, 48000 Hz, stereo
   9.58 A-V: -0.016 aq=   31KB vq=  480KB
plazma:~#

it's perfectly ok!
now, let's check out the sdp...
plazma:~# ffplay darwin.sdp
socket: Address family not supported by protocol
darwin.sdp: Error while parsing header
plazma:~#

and that's it.

so it's a regression regarding the handling of sdp's, and
it's definitely an improvement regarding acc inside mp4.

What could I do?
How could I found out what change broke sdp?
Where should I look regarding the handling of sdp's?

give me some hints please, I'm willing to make a patch for
cvs to fix sdp handling.

Thanks in advance,

Zoltan NAGY,
Sofware Engineer