[haiku-bugs] Re: [Haiku] #9616: MediaConverter doesn't convert to OGG or MP3 and converts to WAV with video
- From: "pulkomandy" <trac@xxxxxxxxxxxx>
- Date: Tue, 21 Oct 2014 09:28:16 -0000
#9616: MediaConverter doesn't convert to OGG or MP3 and converts to WAV with
video
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Reporter: Kev | Owner: nobody
Type: enhancement | Status: new
Priority: normal | Milestone: R1/alpha5
Component: Audio & Video/Codecs | Version: R1/Development
Resolution: | Keywords:
Blocked By: | Blocking: 10722
Has a Patch: 0 | Platform: All
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Comment (by pulkomandy):
I didn't investigate the ffmpeg problem deeply, maybe it's possible to
debug it. Here is what I know about it:
* Because of our constraint to use gcc2, we are using an old version of
ffmpeg. Currently we use version 0.10.14. ffmpeg current releases are at
2.something. They still have maintenance releases for the 0.10 branch,
however (and also for the 0.9 branch. Older ones have no updates since
2013).
* Newer version (0.11 and later) won't compile at all with gcc2.
* Even 0.10 is known to not go along well with gcc2. We got it to compile
with some patching, but it warns on the console that it has been
miscompiled because the compiler didn't align stack variables. Even with
this known issue, decoding seems to work fine.
* But I'm not sure the stack alignment issue is actually related to the
problem. We compile ffmpeg without SSE2 and that should make it safe. It's
easy to check this by testing MediaConvert on a gcc4 system and seeing if
it also crashes there (after reenabling the vorbis encoder).
I think the best way forward is:
* First, we need to get MediaConvert to work reliably with FLAC. The
problems I've hit in my testing were on the decoding side of things. It
seems MediaConvert manages to decode most of the file, but fails at the
last "frame" of audio, which is shorter than others because it hits the
end of the file.
* Once we have this working, we can see if it helps with some of the other
formats.
* If it doesn't, having a vorbis encoder using libvorbis directly is worth
a try.
Do you know if using ffmpeg to encode to ogg/vorbis from the command line
works? If it does, the problem is not related to gcc2 or the way we build
ffmpeg, but to using it in a wrong way in our encoder plugin. Ant it
should be possible to fix that.
--
Ticket URL: <https://dev.haiku-os.org/ticket/9616#comment:9>
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