[Ffmpeg-devel] Odd Missing Video Results

Myron L Stewart mavmann
Wed Jun 7 00:40:20 CEST 2006


I did not create them. I got them from my client. The project I am working
on has to be able to work with just about any mpeg stream. I can see that
the mpeg is poorly created, but it has been difficult convincing my client
on this, especially when avidemux can work with the files. I am not sure
what they are doing. At least I am not the only person who can see the way
these are done are not correct. Thanks for the info. I'll pass this along to
them. I am still trying to see if there is a way around this using ffmpeg.

- Myron L Stewart

> From: M?ns Rullg?rd <mru at inprovide.com>
> Reply-To: FFMpeg development discussions and patches
> <ffmpeg-devel at mplayerhq.hu>
> Date: Tue, 06 Jun 2006 23:35:26 +0100
> To: FFMpeg development discussions and patches <ffmpeg-devel at mplayerhq.hu>
> Subject: Re: [Ffmpeg-devel] Odd Missing Video Results
> Myron Stewart <mavmann at ingeniak.com> writes:
>> Hello,
>> I have been using the ffmpeg library for a project and for some odd reason
>> seeking past the the start on these 2 particular files is causing the video
>> to be missing. The file size seems to indicated video was added, but when
>> you attempt to play the video in for example mediaplayer, quicktime, or vlc,
>> there is only audio. One thing I did notice is that both of these files have
>> swapped audio channels where the audio is on channel 0 and the video is on
>> channel 1.
>> I also did a test with ffmpeg.exe using the ss option to seek ahead and get
>> the same problem. For some reason the ffmpeg library thinks that the first
>> stream is a video stream instead of an audio stream. Here are the 2 files:
> The video elementary stream in those files has no repeated sequence
> headers.  Strictly according to the standard, this is allowed.  It is
> not generally a good idea though, as you have seen.  I'd suggest
> avoiding TMPGEnc if it creates such streams.
> -- 
> M?ns Rullg?rd
> mru at inprovide.com
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> ffmpeg-devel at mplayerhq.hu
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