[FFmpeg-user] Unable to transcode yuv420p file

[Stefano Sabatini]

On date Thursday 2012-01-12 12:18:35 +0530, Atish Kathpal encoded:
> Hello
> 
> I am unable to transcode any yuv420p file using ffmpeg. I am also unable to
> extract any information about the file using ffmpeg -i <file> command. VLC
> is showing random color lines on playing the yuv file. Any pointers on how
> I could make this work?
> 
> ffmpeg -i T2V0041102_Big_Ben_160x600p.yuv -vcodec mpeg4 out.mp4
> ffmpeg version git-2012-01-10-7e2ba2d Copyright (c) 2000-2012 the FFmpeg
> developers
>   built on Jan 10 2012 12:01:19 with gcc 4.6.1
>   configuration: --enable-gpl --enable-libfaac --enable-libmp3lame
> --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libtheora
> --enable-libvorbis --enable-libx264 --enable-nonfree --enable-postproc
> --enable-version3 --enable-x11grab
>   libavutil      51. 34.100 / 51. 34.100
>   libavcodec     53. 54.100 / 53. 54.100
>   libavformat    53. 29.100 / 53. 29.100
>   libavdevice    53.  4.100 / 53.  4.100
>   libavfilter     2. 58.100 /  2. 58.100
>   libswscale      2.  1.100 /  2.  1.100
>   libswresample   0.  6.100 /  0.  6.100
>   libpostproc    51.  2.100 / 51.  2.100

> [IMGUTILS @ 0x7fffe20fa650] Picture size 0x0 is invalid
> [IMGUTILS @ 0x7fffe20fa550] Picture size 0x0 is invalid
> [rawvideo @ 0x35447e0] Could not find codec parameters (Video: rawvideo,
> yuv420p)

This is a rawvideo yuv file so you need to specify manually the input
parameters, or ffmpeg won't know how to figure out it. Check the
rawvideo demuxer options:

rawvideo demuxer AVOptions:
-video_size        <string> .D... A string describing frame size, such as 640x480 or hd720.
-pixel_format      <string> .D... 
-framerate         <string> .D... 

[...]
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