[FFmpeg-user] pixelated video after inserting a logo

[Stefano Sabatini]

On date Saturday 2012-05-19 19:20:33 -0300, Rossana Guerra encoded:
> Hi, well I did what you suggested, but it didn't improve the result so much.
> 
> First I found out the codec: ffmpeg -i video1.avi
> 
> Seems stream 0 codec frame rate differs from container frame rate: 30000.00
> (30000/1) -> 23.98 (24000/1001)
> Input #0, avi, from 'video1.avi':
>   Metadata:
>     encoder         : VirtualDubMod 1.5.10.1 (build 2366/release)
>   Duration: 00:23:18.52, start: 0.000000, bitrate: 1308 kb/s
>     Stream #0.0: Video: mpeg4, yuv420p, 720x400 [PAR 1:1 DAR 9:5], 23.98
> fps, 23.98 tbr, 23.98 tbn, 30k tbc
>     Stream #0.1: Audio: mp3, 44100 Hz, stereo, s16, 128 kb/s
> 
> And then I applied the codec and bitrate:
> 

> ffmpeg -i video1.avi -vf "movie=md.png [logo]; [in][logo]
> overlay=W-w-10:10[out]" -vcodec mpeg4 -b 1400 out1.avi

Value for -b is expressed in *bits per seconds*, so 1400 is
definitively low, use -b 1400k instead.

Also you may try the libx264 encoder (mpeg4 is the default choice for
the AVI container, so no need to explicitely specify it).
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