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

[Grozdan]

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

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