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[Mike Hicks <hick0088@xxxxxxxxxx>]

Yes, I believe this is likely a bug in MLT.

Yes, a "pcm_s16le" codec is listed under Edit -> Preferences -> AV
Formats, among many other "pcm_*" codecs.

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Videos with uncompressed PCM audio don't play sound properly
https://bugs.launchpad.net/bugs/572020
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Status in OpenShot Video Editor: New

Bug description:
I am using openshot-1.1.3-karmic1 on Ubuntu 9.10, installed from PPA.  I also have melt-0.4.4-2build1 installed.

I am trying to edit videos created by my Canon EOS Rebel T2i (aka 550D and Kiss X4).  This camera uses a .mov file format using h.264 video with uncompressed PCM audio.  When I try to play the video in OpenShot, audio is only output for a fraction of a second.

Sound works correctly when I play files using "ffplay".

Sound fails after a fraction of a second when I play files with "melt".

Here's what "ffmpeg -i" says when I point it at one of my files:

    Seems stream 0 codec frame rate differs from container frame rate: 59.94 (60000/1001) -> 29.97 (30000/1001)
    Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'mvi_0272.mov':
      Duration: 00:00:16.54, start: 0.000000, bitrate: 47683 kb/s
        Stream #0.0(eng): Video: h264, yuv420p, 1920x1080, 29.97 tbr, 29.97 tbn, 59.94 tbc
        Stream #0.1(eng): Audio: pcm_s16le, 48000 Hz, stereo, s16, 1536 kb/s
    At least one output file must be specified

For the moment, it appears I will be able to get around this by transcoding audio in the files (from PCM to AC3) with a command similar to this:

    ffmpeg -i input.mov -vcodec copy -acodec ac3 -ab 384k output.mov

I'll try to upload an attachment, a few seconds of 640x480 video.  The audio is just fan noise.