[MPlayer-users] OT maybe, Struggling to conactenate MP4 files

Nick Batt nick at sonicstate.com
Wed Jan 26 13:43:11 CET 2011

Thanks Tom, tried the complex version which does appear to work well
although the final output file is 3x the size of the concatenated files,
I've not entirely sure how to modify the final output to get somewhere close
to my original size
800kbps h264 video, 128k audio AAC stereo 48khz

last line is currently
ffmpeg -f u16le -acodec pcm_s16le -ac 2 -ar 48000 -i all.a \
       -f yuv4mpegpipe -i all.v \
       -sameq -y /opt/enctest/ffoutput.mp4

Sorry, I'm not terribly ffmpeg literate


On 26 January 2011 11:38, Tom Evans <tevans.uk at googlemail.com> wrote:

> On Wed, Jan 26, 2011 at 11:17 AM, Nick Batt <nick at sonicstate.com> wrote:
> > Hi, first of all - helloI'm trying to streamline a workflow and ad a top
> and
> > tail to my MP4 files.
> > However using MP4Box, which appears to be the only game in town, I get
> new
> > tracks added no matter what sort of switches I add to -add or -cat.
> > Result always appears to be both video and audio streams but on separate
> > tracks.
> >
> > Cant seem to figure out any way to acheive this. Both files are h264
> 25fps
> > 640x360 AAC 48000 created from the same transcoding process.
> >
> > I'm hoping to be able to automate this process, but fell at the first.
> >
> > Running this on an EC2 instance Centos 5.X
> >
> > Many thanks
> I'd use ffmpeg (its an FAQ: http://www.ffmpeg.org/faq.html#TOC27 ).
> You want the complex example, joining two flv files with named pipes.
> Cheers
> Tom
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