[FFmpeg-user] converting a previous cuted file, Invalid pixel format string '-1'

[Enrico Kern]

   Hi all,

maybe someone can help me with this issue. I use the latest ffmpeg from 
trunk from today but i guess older ones are affected too.

- I have a FLV file which contains H264 video and mp3 audio, the file is 
recorded by WowzaMediaServer
- I cut this file with ffmpeg in multiple parts with ffmpeg -i $input 
-ss $time -t $time $output.flv

That works fine, the file also plays in flash and players. Now however i 
want to transcode this cuted file to another format,
that doesnt work. ffmpeg returns with this:

ffmpeg -i cuterror.flv -y test.webm
FFmpeg version SVN-r26402, Copyright (c) 2000-2011 the FFmpeg developers
   built on May 17 2011 07:24:46 with gcc 4.1.2 20080704 (Red Hat 4.1.2-50)
   configuration: --enable-version3 --enable-libopencore-amrnb 
--enable-libopencore-amrwb --enable-libvpx --enable-libfaac 
--enable-libmp3lame --enable-libtheora --enable-libvorbis 
--enable-libx264 --enable-libxvid --disable-ffplay --enable-shared 
--enable-gpl --enable-postproc --enable-nonfree --enable-avfilter 
--enable-pthreads --extra-cflags=-fPIC
   libavutil     50.36. 0 / 50.36. 0
   libavcore      0.16. 1 /  0.16. 1
   libavcodec    52.108. 0 / 52.108. 0
   libavformat   52.93. 0 / 52.93. 0
   libavdevice   52. 2. 3 / 52. 2. 3
   libavfilter    1.74. 0 /  1.74. 0
   libswscale     0.12. 0 /  0.12. 0
   libpostproc   51. 2. 0 / 51. 2. 0
[flv @ 0x1e698510] max_analyze_duration reached
[flv @ 0x1e698510] Estimating duration from bitrate, this may be inaccurate
Input #0, flv, from 'cuterror.flv':
   Metadata:
     duration        : 573
     width           : 1152
     height          : 720
     videodatarate   : 200
     framerate       : 1000
     videocodecid    : 7
     audiodatarate   : 100
     audiosamplerate : 44100
     audiosamplesize : 16
     stereo          : false
     audiocodecid    : 2
     encoder         : Lavf52.84.0
     filesize        : 37793482
   Duration: 00:09:32.92, start: 0.002000, bitrate: 307 kb/s
     Stream #0.0: Video: h264, 204 kb/s, 1k tbr, 1k tbn, 1k tbc
     Stream #0.1: Audio: mp3, 44100 Hz, 1 channels, s16, 102 kb/s
[buffer @ 0x1e6abc30] Invalid pixel format string '-1'
Error opening filters!


I can of course write the file to this format when i cut them, but thats 
not possible in our production environment, as we need
the flash files for our website players. I need the ability to convert 
them later to webm for html5 integration. But it doesnt matter
if i use webm or any other codec/container, the error stays the same 
even if i just want todo a copy of the streams.

Anyone got a idea of whats wrong here? A cutted demonstration file can 
be downloaded here:

http://master.inacdn.com/cuterror.flv  (36MB)

Regards,

Enrico

-- 

[Clavain Technologies Ltd.]

Enrico Kern, Managing Director
kern at clavain.co.uk
www.clavain.co.uk


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SWITZERLAND

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