ogg dev - May 2009 - oggz-merge / oggJoin with files created with oggCat

Hi Yorn,

all files can be found at http://firefogg.org/~j/oggmix/

audio.ogg and video.ogg are create with oggCat:

  oggCat audio.ogg audio_01.ogg audio_02.ogg

  oggCat video.ogg video_01.ogg video_02.ogg

oggJoin.mix.ogg is made with oggJoin:
  oggJoin mix.oggJoin.ogg video.ogg audio.ogg

mix.oggz-merge.ogg is made with oggz-merge:
  oggz-merge -o mix.oggz-merge.ogg video.ogg audio.ogg


in my test samples audio.ogg is already not working.
second part is scrambled.

oggz-validate does not give any errors for audio.ogg and video.ogg

j

j

I think, I got the problem:

When I re-encode both audio files with the same quality/bitrate, oggCat/oggJoin
works as expected.

The reason, that it does not work, is as follows: I had a lot of trouble
concatenate the audio-files (as I was starting with video only). In many cases,
the concatenation works even if the bitrate does not correspond (correct me if I
am wrong). In some cases (ffmepg) the bitrate is not given in the ogg-header.
Therefor I ignore the failing bitrate-test. The test is actually only done for
channels and sample rate.

In your case this does not work. So what you need to do is: re-encode the
ogg/vorbis files to the same bitrate.

oggz-validate does not complain about the problem as it is the layer above
(vorbis), that fails.


Hope that helps!

-Yorn   


-------- Original-Nachricht --------
> Datum: Tue, 05 May 2009 14:01:48 +0200
> Von: j at v2v.cc
> An: yorn at gmx.net
> CC: ogg-dev at xiph.org
> Betreff: Re: [ogg-dev] oggz-merge / oggJoin with files created with oggCat
> Hi Yorn,
> 
> all files can be found at http://firefogg.org/~j/oggmix/
> 
> audio.ogg and video.ogg are create with oggCat:
> 
>   oggCat audio.ogg audio_01.ogg audio_02.ogg
> 
>   oggCat video.ogg video_01.ogg video_02.ogg
> 
> oggJoin.mix.ogg is made with oggJoin:
>   oggJoin mix.oggJoin.ogg video.ogg audio.ogg
> 
> mix.oggz-merge.ogg is made with oggz-merge:
>   oggz-merge -o mix.oggz-merge.ogg video.ogg audio.ogg
> 
> 
> in my test samples audio.ogg is already not working.
> second part is scrambled.
> 
> oggz-validate does not give any errors for audio.ogg and video.ogg
> 
> j

> 
> I think, I got the problem:
> 
> When I re-encode both audio files with the same quality/bitrate,
oggCat/oggJoin works as expected.
> 
> The reason, that it does not work, is as follows: I had a lot of trouble
concatenate the audio-files (as I was starting with video only). In many cases,
the concatenation works even if the bitrate does not correspond (correct me if I
am wrong). In some cases (ffmepg) the bitrate is not given in the ogg-header.
Therefor I ignore the failing bitrate-test. The test is actually only done for
channels and sample rate.
> 
> In your case this does not work. So what you need to do is: re-encode the
ogg/vorbis files to the same bitrate.
> 
> oggz-validate does not complain about the problem as it is the layer above
(vorbis), that fails.
encoding each audio part, i.e with
oggdec audo_*.ogg
oggenc audio_*.wav

oggJoin produces a file that sounds ok;
it still does not work with oggJoin though.

if i run oggdec/oggenc on audio.ogg oggJoin works.

j
> >> all files can be found at http://firefogg.org/~j/oggmix/
>>
>> audio.ogg and video.ogg are create with oggCat:
>>
>>   oggCat audio.ogg audio_01.ogg audio_02.ogg
>>
>>   oggCat video.ogg video_01.ogg video_02.ogg
>>
>> oggJoin.mix.ogg is made with oggJoin:
>>   oggJoin mix.oggJoin.ogg video.ogg audio.ogg
>>
>> mix.oggz-merge.ogg is made with oggz-merge:
>>   oggz-merge -o mix.oggz-merge.ogg video.ogg audio.ogg
>>
>>
>> in my test samples audio.ogg is already not working.
>> second part is scrambled.
>>
>> oggz-validate does not give any errors for audio.ogg and video.ogg
>>
>> j
>