[MEncoder-users] How to join avi files with x264 streams?

[Grozdan]

On Sat, May 8, 2010 at 4:50 PM, Josef Wolf <jw at raven.inka.de> wrote:
> On Sat, May 08, 2010 at 03:31:53PM +0200, Grozdan wrote:
>> On Sat, May 8, 2010 at 3:29 PM, Josef Wolf <jw at raven.inka.de> wrote:
>> > On Sat, May 08, 2010 at 01:41:05PM +0200, Grozdan wrote:
>> >> On Sat, May 8, 2010 at 11:48 AM, Josef Wolf <jw at raven.inka.de> wrote:
>> >> > On Fri, May 07, 2010 at 10:29:31AM -0500, Laine Lee wrote:
>> >> >> On 5/7/10 1:00 AM, "Josef Wolf" <jw at raven.inka.de> wrote:
>> >> >> > I have captured my old VHS recordings with mencoder and created x264 avi's
>> >> >> > using two-pass with those options:
>> >> >> >
>> >> >> >   -ovc x264 -x264encopts
>> >> >> > bitrate=800:pass=2:subq=7:frameref=15:subq=6:frameref=15:me=umh:partitions=all
>> >> >> > :8x8dct:direct_pred=auto:me_range=64:trellis=2:bframes=5:b_pyramid:weight_b:th
>> >> >> > reads=auto:nr=1000
>> >> >> >
>> >> >> > In the next step, I want to join some of those files. I tried:
>> >> >> >
>> >> >> >   mencoder -ovc copy -oac copy -o outfile.avi file1.avi file2.avi
>> >> >> >
>> >> >> > But the resulting file has some strange artefacts in the first ten seconds
>> >> >> > after the join position (that is, in the first ten seconds of file2.avi)
>> >> >> > which are _not_ present in the original file2.avi.
>> >> >> >
>> >> >> > Why does "-ovc copy" do any manipulations on the stream?
>> >> >> >
>> >> >> > Any ideas?
>> >> >>
>> >> >> Can you use "MP4Box -cat"?
>> >> >>
>> >> >> http://gpac.sourceforge.net/doc_mp4box.php
>> >> >
>> >> > jw at ubuntu:MP4Box -cat 01.avi -cat 02.avi t.avi
>> >> > H264/AVC Video format not supported in AVI - please extract to raw format
>> >> > first
>> >> > Error appending 01.avi: Feature Not Supported
>> >> >
>> >> > Do I have to re-encode into another format first? But then I would loose
>> >> > quality?
>> >>
>> >> No, you have to do exactly as it says above. Extract the video from
>> >> the avi container. Done like this
>> >>
>> >> MP4Box -aviraw video yourfile.avi
>> >
>> > Yeah, this seems to work. But now I loose A/V-sync again =:-(
>> >
>> > This is what I do:
>> >
>> >  MP4Box -aviraw video file1.avi
>> >  MP4Box -aviraw video file2.avi
>> >
>> >  MP4Box -aviraw audio file1.avi
>> >  MP4Box -aviraw audio file2.avi
>> >
>> >  MP4Box -cat file1_video.h264 -cat file2_video.h264 out.h264
>> >  MP4Box -cat file1_audio.mp3  -cat file2_audio.mp3  out.mp3
>> >
>> >  MP4Box -add out.mp3 -add out.h264 out.mpg
>> >
>> > What am I doing wrong?
>>
>> You need to pass the correct -fps value to MP4Box, which by default uses 25fps
>
> Umm, the recordings _are_ 25fps...

And I'm supposed to know that how?

There must be some other problem..

What kind of sync problem? Does it start right away or does it
gradually build up over time?

If this doesn't work, you can always try it with ffmpeg instead of
mencoder. Just use multiple -i option, eg
ffmpeg -i file1.avi -i file2.avi ...

and copy audio and video with -acodec copy -vcodec copy

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