[Ffmpeg-devel] [Ffmpeg-devel-old] SVCD bug

[Måns Rullgård]

Colin Ward <lists at codehq.org> writes:

> M?ns Rullg?rd wrote:
>> I can think of many reasons to want a proper MPEG file rather than a
>> VCD
>> encapsulated one.  The OP's file apparently causes problems for ffmpeg.
>>
>>>    I have a VCD related problem that I have been meaning to look into.
>>> I have a couple of .dat files from a couple of different VCDs.  One of
>>> them plays in my FFMPEG based program and the other causes either
>>> av_open_input_file() or av_find_stream_info() to return an "unknown
>>> format" error.  I can't remember exactly at the moment as I am not in
>>> front of my development computer.
>>>
>>>    Why would one VCD .dat file be playable and not the other?
>> Post some samples, please.
>
>    Sorry for the delay, I haven't been home for a few days to upload
>    the samples.  They can be found here:
>
>    http://www.codehq.org/Robots.dat
>    http://www.codehq.org/Legue.dat
>
>    They are both the first 1 MB from the respective .dat files on the
>    VCD.  As I said, one of them opens successfully and the other
>    returns an "unknown format" error.  And yet they both open
>    successfully with MPlayer.

Those files are both unmunged MPEG1 system streams, except for one
thing.  The one that fails (Legue.dat) starts with a block of 0x11058
zeros.  That is more junk than lavf searches when checking the file
format.

-- 
M?ns Rullg?rd
mru at inprovide.com