[Ffmpeg-devel] [ppm @ 0x40415168]picture size invalid (1x0)

[Martin Stoll]

Hi,

I tried to pipe a stream of ppm file into ffmpeg to create a video.
However, the following command sequence causes ffmpeg to complain about
an invalid picture size and produces a video which is garbled after some
time.

> convert -size 160x128 -depth 8 xc:white white.ppm
> i=0
> while [ $((i<10000)) == 1 ]; do let i=$((i+1)); cat white.ppm ; done |
ffmpeg -f image2pipe -vcodec ppm -i - -s 160x128 -r 25 -b 90 -f
mpeg2video -aspect 4:3 -y out.mpv

The output is as follows:

FFmpeg version SVN-r6005, Copyright (c) 2000-2004 Fabrice Bellard
  configuration:  --shlibdir=/usr/lib --prefix=/usr
--mandir=/usr/share/man --libdir=/usr/lib --enable-shared
--enable-mp3lame --enable-libogg --enable-vorbis --enable-faad
--enable-faac --enable-xvid --enable-a52 --enable-x264 --enable-pp
--enable-gpl --enable-gprof --enable-amr_nb --enable-amr_wb 
  libavutil version: 49.0.0
  libavcodec version: 51.11.0
  libavformat version: 50.5.0
  built on Aug 17 2006 01:01:36, gcc: 4.0.2 20050901 (prerelease) (SUSE
Linux)
Input #0, image2pipe, from 'pipe:':
  Duration: N/A, bitrate: N/A
  Stream #0.0: Video: ppm, rgb24, 160x128, 25.00 fps(r)
Output #0, mpeg2video, to 'out.mpv':
  Stream #0.0: Video: ppm, rgb24, 160x128, q=2-31, 90 kb/s, 25.00 fps(c)
Stream mapping:
  Stream #0.0 -> #0.0
[ppm @ 0x40415168]picture size invalid (1x0)bitrate=12291.0kbits/s    
[ppm @ 0x40415168]picture size invalid (1x0)
[ppm @ 0x40415168]picture size invalid (16x0)itrate=12291.0kbits/s    
[ppm @ 0x40415168]picture size invalid (16x0)
[ppm @ 0x40415168]picture size invalid (160x0)trate=12291.0kbits/s    
[ppm @ 0x40415168]picture size invalid (160x0)
[ppm @ 0x40415168]picture size invalid (160x0)trate=12291.0kbits/s    
[ppm @ 0x40415168]picture size invalid (160x0)
Error while decoding stream #0.0B time=97.1 bitrate=12291.0kbits/s    
[Ctrl-C hit]
Error while decoding stream #0.0
frame= 2457 q=0.0 Lsize=  147456kB time=98.3 bitrate=12291.0kbits/s    
video:147456kB audio:0kB global headers:0kB muxing overhead 0.000000%
Received signal 2: terminating.


Unfortunately, you can't see the frame numbers here anymore. The frame
at which the first "[ppm @ 0x40415168]picture size invalid (1x0)"
message comes is around number 1400. The other ones follow rapidly.
I can't compile ffmpeg myself, so I can't send you a backtrace. But I
hope that this report is sufficiently complete.

Note that when I create 10000 pictures white_%05d.ppm instead and run
ffmpeg -i white_%05d.ppm ... with the same parameters then the encoding
is error free!

Thanks,
Martin