[FFmpeg-user] AVI, WMV, FLV, MOV and MP4 to libx264 MP4 conversion bugs

[Teshan Nanayakkara]

When I use this command in terminal for all the video formats it worked
like a magic. but i put it in a live online site it didnt work for some
files. So can you please write down the correct commands for each file
format (avi, flv, wmv, mov, mp4) ? Output video height should be less than
or equal to 360p, mp4, h.264 compatible,

On Sat, Jan 5, 2013 at 1:31 AM, Lou <lou at lrcd.com> wrote:

> On Sat, 5 Jan 2013 00:53:21 +0530
> Teshan Nanayakkara <teshan87 at gmail.com> wrote:
>
> > Hi there,
> >
> > I have used the following command line expression to compress and convert
> > AVI, WMV, FLV, MOV and MP4 files to libx264 MP4.
> >
> > *ffmpeg -i abc.flv -vcodec libx264 -vf scale=-1:360 -qscale 7 -acodec
> > libvo_aacenc -ab 32 -ar 24000 abc.mp4*
> >
> > To run this command I use PHP exec() function. I need to know the most
> > appropriate and the correct commands to convert each and every (above
> > mentioned) format to H.264 MP4 format without changing the aspect ratio
> and
> > video height less than or equal to 360 pixels. And with aac audio
> encoding
> > codec. Sometimes ffmpeg fails to convert above formats but not always. It
> > may be depending on the source file's codecs. So I need to know how the
> > above command should be modified to convert each video format mentioned
> > above.
> >
> > Thanks
>
> The complete console outputs are missing. Without the ffmpeg commands
> and console outputs we can only make guesses since "fails to convert"
> is not as descriptive as any actual ffmpeg messages or errors.
>
> You should first run the ffmpeg commands manually, that is outside of
> PHP, until you get a satisfactory result.
>
> Some other stuff:
>
> * libvo_aacenc isn't a great AAC encoder.
>
> * libx264 probably ignores qscale resulting in the default of "-crf
>   24". This usually provides a decent output buy maybe not what you
>   want.
>
> * "-ab" takes a value in bits, not kilobits, so use "-ab 32k".
>
> * "-ar 24000" seems unnecessary.
>
> * If the resulting width is an odd value then libx264 will complain
>   with "height not divisible by 2". scale="trunc(oh*a*2)/2:360" should
>   automatically round down to an even value if odd.
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