[FFmpeg-user] Convert some hundreds files to a H264

belcampo belcampo at zonnet.nl
Tue May 17 22:22:27 CEST 2011

On 05/17/11 18:24, Mailing List wrote:
> marcos rebelo<oleber at gmail.com>  wrote in
> news:BANLkTi=43-RGdG9h4LPx+mi2AcxdZyv-zQ at mail.gmail.com:
>> I was giving some hundreds of files (more will come) with
>> different formats (div, avi, mov, ...) and different sizes to be
>> converted to H264 with:
>>     a maximum width 720,
>>     -b         500k
>>     -bt        500k
>>     -acodec  libfaac
> As others have suggested, using a simple loop to process the files is not
> particularly difficult.  The only issue is your "maximum width 720".  Using
> -vf "scale=720:-1" is unreliable because it throws errors for odd-numbered
> heights, instead of rounding to a usable value as mencoder can.
It throws error-messages for not-optimal, in the sense of not-optimal in 
file-size, encodings but it will encode nevertheless without trouble AFAIK.
> You could parse the output of either "ffprobe" or "ffmpeg -i" for the
> display aspect ratio and use it to calculate scaling dimensions, but it
> makes the script considerably more complex.  My own crude solution is in
> Windows batch, which wouldn't help you with Perl.
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