[Ffmpeg-devel] problems transcoding a cinepak avi to mpeg

[Michel Bardiaux]

Phil C wrote:
>  I'm using the newest cvs version (12.6.05)  trying to trans-code a cinepak avi to a mpeg. even though the  trans-coding seemed to go off without a hitch but the resulting video  was all black even though the sound was present. 
>   
>   the command line:
>   
>   ffmpeg -i cinepak720x480.avi  -f mpeg -r 29.97 -s 176x120 -b 700 -ar 4
>   4100 -ab 192  out.mpg                     
>   
>   console output:
>   
>   ffmpeg version CVS, build 3277056, Copyright (c) 2000-2004 Fabrice Bellard
>     configuration:  --enable-mp3lame --enable-mingw32  --enable-a52 --enable-gpl --enable-memalign-hack --enable-pp  --extra-cflags=-I/local/include --extra-ldflags=-L/local/lib 
>     built on Dec  6 2005 14:43:11, gcc: 3.4.2 (mingw-special)
>   Input #0, avi, from 'cinepak720x480.avi':
>     Duration: 00:00:30.0, start: 0.000000, bitrate: 20637 kb/s
>     Stream #0.0, 29.97 fps: Video: cinepak, yuv420p, 720x480
>     Stream #0.1: Audio: pcm_s16le, 44100 Hz, stereo, 1411 kb/s
>   Output #0, mpeg, to 'out.mpg':
>     Stream #0.0, -1.#J fps: Video: mpeg1video, yuv420p, 176x120, q=2-31, 700 kb/s
>     Stream #0.1: Audio: mp2, 44100 Hz, stereo, 192 kb/s
>   Stream mapping:
>     Stream #0.0 -> #0.0
>     Stream #0.1 -> #0.1
>   [mpeg1video @ 00681638]warning, clipping 1 dct coefficients to -255..255
>   [mpeg1video @ 00681638]warning, clipping 1 dct coefficients to -255..255
>   [mpeg1video @ 00681638]warning, clipping 1 dct coefficients to -255..255
>   [mpeg1video @ 00681638]warning, clipping 1 dct coefficients to -255..255
>   frame=  901 q=0.0 Lsize=    1002kB time=30.0 bitrate= 273.3kbits/s    
>   video:286kB audio:704kB global headers:0kB muxing overhead 1.240184%
>   
>   
>   is there a library that i'm missing? as i understood it cinepak was natively supported.
>   
>   Thanks for the help
>   
>   Phil
>   
Seems to be. I see 2 anomalies: the input bitrate (20MEGAbits!) and the 
output fps.

-- 
Michel Bardiaux
R&D Director
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