avi video file length incorrectly reported 2x longer

[ullix]

An *.avi video file is reported with a length exactly 2x of the true length. Same bug is found in Kdenlive, but not in Pitivi, so it amy be a problem of MLT?

The file:
recorded with a digital camera as *.avi. Length is handstopped 16.5-16.8 sec. Nautilus reports 16 sec.

Tested on Lucid:
Openshot1.1: lenght is 32 sec,
pitivi: 16sec

Tested on intrepid:
Openshot 1.1: 32 sec,
Kdenlive 0.6.0: 32 sec,
Pitivi 0.11.1: 16 sec

Beyond 16sec of playback, Openshot shows a white picture, kdenlive a black picture, with some scratchy sound in both marking the failure point

[Jonathan Thomas (jonoomph)]

Thanks for reporting this bug! Please take a look at this FAQ I put together on how to report video files that do not work with OpenShot: https://answers.launchpad.net/openshot/+faq/983. -Jonathan

[ullix (ullix)]

I prepared an approx. 5 sec clip and tested

1) ffplay -stats test.avi
shows a length of 10.2 sec. plays properly for ~5sec and freezes at the last frame. The counter shows 10.26; "A-V:" (whatever this is) continues to count showing numbers -50 and growing more negative apparently indefinitely.

2) melt -verbose test.avi
plays the clip correctly; i can jump and single step back and forth, no problem. I don't know how to make it show a time, but when the "Current position" reaches ~150 the picture turns white, the counter continues up to 256, then stops showing the last frame. I can jump back to the beginning.

3)ffmpeg -i test.avi
$ ffmpeg -i test.avi
provides also the wrong duration of 10.2 sec; it is only ~5sec

FFmpeg version r11872+debian_3:0.svn20080206-12ubuntu3.1, Copyright (c) 2000-2008 Fabrice Bellard, et al.
  configuration: --enable-gpl --enable-pp --enable-swscaler --enable-x11grab --prefix=/usr --enable-libgsm --enable-libtheora --enable-libvorbis --enable-pthreads --disable-strip --enable-libfaad --enable-libfaadbin --enable-liba52 --enable-liba52bin --enable-libdc1394 --disable-armv5te --disable-armv6 --disable-altivec --disable-vis --enable-shared --disable-static
  libavutil version: 49.6.0
  libavcodec version: 51.50.0
  libavformat version: 52.7.0
  libavdevice version: 52.0.0
  built on Mar 13 2009 17:48:10, gcc: 4.3.2
Input #0, avi, from 'test.avi':
  Duration: 00:00:10.2, start: 0.000000, bitrate: 7607 kb/s
    Stream #0.0: Video: mjpeg, yuvj422p, 640x480 [PAR 0:1 DAR 0:1], 30.00 tb(r)
    Stream #0.1: Audio: pcm_s16le, 22050 Hz, mono, 352 kb/s
Must supply at least one output file

4) file test.avi is attached

[ullix (ullix)]

I tried conversion of the test.avi file into different formats with ffmpeg (under Lucid). It failed with the output formats mov and mp4 with these error messages

ffmpeg -i testvideoedit/test.avi test.mov
...
[mpeg4 @ 0x92bf4b0]timebase not supported by mpeg 4 standard

ffmpeg -i testvideoedit/test.avi test.mp4
...
[mpeg4 @ 0x83a94b0]timebase not supported by mpeg 4 standard

It did work using flv and mpeg as output formats (but the quality was poor).

[moimael (moimael)]

Works great with mlt 0.6. Mark this as fixed.