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

[Nick Batt]

Thanks to Tom for pointing me in the right direction piping the two files
and then rencoding them, this works fine, though the resulting file
 somewhat large and the MP4 is perian codec.

ffmpeg -f u16le -acodec pcm_s16le -ac 2 -ar 48000 -i all.a \
>        -f yuv4mpegpipe -i all.v \
>        -sameq -y /opt/enctest/ffoutput.mp4
>
> I need to get it as H264 at around 900kbps all in with 48k audio SR

> So I tried this,
>

   ffmpeg -f u16le -acodec pcm_s16le -ac 2 -ar 48000 -i all.a \

       -f yuv4mpegpipe -i all.v \
       -vcodec libx264 -vpre normal -acodec libmp3lame -ar 48000 -ab 128k -y
/opt/menctest/ffoutput.mp4

 but resulting file gives me an incorrect sample header in QuickTime when I
try to play it.





> Nick
>
>
> 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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>
>