[FFmpeg-user] trying to work out ffmpeg and avi conversion

[belcampo]

On 05/12/11 10:25, mroper wrote:
> hi,
>
>
>
> hoping someone can help, i'm fairly new to ffmpeg, trying to
> work out how to convert an HD 1280x720 AVI file to mpeg2 so my
> tv via linux media tomb can play it.
>
>
>
> When i try doing....
>
>
>
> ffmpeg -i "$filename" -target pal-dvd -b 25000k
> /destpath/$filename
>
>
>
> i get .....Error while opening encoder for output stream #0.0- maybe
> incorrect parameters such
> as bit_rate, rate, width or height
>
>
> i've tried searching on the error and drawn a blank, lots of information
> but nothing I can relate to it. likewise the man pages don't give me a
> clue. reason why I have the -b 25000k is I'm trying to maintain the
> quality of the orginal avi, if I don't set this it works fine. likewise
> if I set a lower rate it also works fine (but at lower quality). The
> orginal avi when doing a ffmpeg -i filename shows up
>
> Stream #0.0: Video: mjpeg, yuvj422p, 1280x720, 30 tbr, 30 tbn, 30 tbc
> Metadata:
> strn : FUJIFILM AVI STREAM 0100
> Stream #0.1: Audio: pcm_s16le, 44100 Hz, 2 channels, s16, 1411 kb/s
>
> Where as the best I can get is via
>
> ffmpeg -i "$filename" -target pal-dvd -s hd720 /destpath/$filename
>
> and produces
>
> Duration: 00:00:02.00, start: 0.500000, bitrate: 7176 kb/s
> Stream #0.0[0x1e0]: Video: mpeg2video, yuv420p, 1280x720 [PAR 1:1 DAR
> 16:9], 9000 kb/s, 25 fps, 25 tbr, 90k tbn, 50 tbc
> Stream #0.1[0x80]: Audio: ac3, 48000 Hz, stereo, s16, 448 kb/s
>
> Which has a much lower quality/bitrate (you can see the difference on
> screen).
target pal-dvd is limited to 9000 kb/s AFAIK, the dvd-spec doesn't allow 
more.
You'll have to remove 'target pal-dvd' and specify the parameters 
your-self like vcodec mpeg2 -b 25000k and then it should work. You also 
have to specify -acodec to something your TV 'understands'.
>
> Any ideas?
>
> Thanks
>
> Miles
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