[MEncoder-users] Opening Local SDP files with mencoder

Carl Eugen Hoyos cehoyos at ag.or.at
Sun Feb 9 19:34:17 CET 2014

Ben Barker <ben <at> bbarker.co.uk> writes:

> The reason I was using mencoder was that I found if 
> I joined a multicast stream using a local SDP from ffmpeg, 
> either copying the video (so no transcoding), or 
> transcoding directly, then about 50% of the time the 
> output file could not then be opened again by ffmpeg - 
> complaining of damaged headers, and being able to open it 
> with ffmpeg was important for future processing.

(For transcoding, this sounds impossible to me and if you 
would report this bug, it would be very welcome!)

> Interetsinbgly, that same file that ffmpeg created, then 
> rejected, could reliably always be opened by either VLC 
> or mencoder / mplayer.

Such a sample would be *very* welcome!

> Capturing using mencoder I never had this problem, and ffmpeg 
> could always accept the mencoder output file. Since the 
> underlying libraries are the same in both cases, presumably 
> this is down to some extra checking mencoder is doing that 
> ffmpeg is not...?

The underlying libraries are not the same, if you install an old version of
live555 on your system and recompile MEncoder, it will use it.

Carl Eugen

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