Fix an output MP4 file broken in crash
Posted: 25 Feb 2006 01:55
Hi,
I recordered an important TV program with VLC, by saving the streams to an MP4 container. It usually works fine. But this time, VLC crashed right at the end, when I stopped the save. The resulting file is damaged and cannot be played by anything, not even VLC. I suppose this is because at close time, VLC needs to fix some header structure or something. So I have the file with "raw" data, which I know the characteristics, but I cannot play it. Can I fix it?
For info, here is the debugging output from VLC:
I am a programmer, I know my way in a hex editor, so even a kludge will be OK. I can provide the files obviously (or their dumps).
TIA
Jean-Denis
I recordered an important TV program with VLC, by saving the streams to an MP4 container. It usually works fine. But this time, VLC crashed right at the end, when I stopped the save. The resulting file is damaged and cannot be played by anything, not even VLC. I suppose this is because at close time, VLC needs to fix some header structure or something. So I have the file with "raw" data, which I know the characteristics, but I cannot play it. Can I fix it?
For info, here is the debugging output from VLC:
Code: Select all
[00000249] main playlist debug: creating new input thread
[00000313] main input debug: waiting for thread completion
[00000313] main input debug: thread 61197312 (input) created at priority 37 (src/input/input.c:230)
[00000313] main input debug: `/Volumes/MiniCat/TVFree/Calais.mp4' gives access `' demux `' path `/Volumes/MiniCat/TVFree/Calais.mp4'
[00000313] main input debug: creating demux: access='' demux='' path='/Volumes/MiniCat/TVFree/Calais.mp4'
[00000314] main demuxer debug: looking for access_demux module: 1 candidate
[00000252] macosx interface debug: input has changed, refreshing interface
[00000313] main input debug: creating access '' path='/Volumes/MiniCat/TVFree/Calais.mp4'
[00000315] main access debug: looking for access2 module: 4 candidates
[00000315] vcd access debug: trying .cue file: /Volumes/MiniCat/TVFree/Calais.cue
[00000315] access_file access debug: opening file `/Volumes/MiniCat/TVFree/Calais.mp4'
[00000036] main module debug: using access2 module "access_file"
[00000316] main private debug: pre buffering
[00000316] main private debug: received first data for our buffer
[00000316] main private debug: prebuffering done 1114078 bytes in 0s - 6339 kbytes/s
[00000313] main input debug: creating demux: access='' demux='' path='/Volumes/MiniCat/TVFree/Calais.mp4'
[00000317] main demuxer debug: looking for demux2 module: 39 candidates
[00000316] mp4 private debug: found Box: ftyp size 20
[00000316] mp4 private debug: found Box: wide size 8
[00000316] mp4 private debug: skip box: "wide"
[00000316] mp4 private debug: found Box: mdat size 1332018939
[00000316] mp4 private debug: skip box: "mdat"
[00000316] mp4 private debug: found Box: ??? size 3938399354
[00000316] mp4 private warning: unknown box type ??? (uncompletetly loaded)
[00000316] mp4 private debug: dumping root Box "root"
[00000316] mp4 private debug: | + ftyp size 20
[00000316] mp4 private debug: | + wide size 8
[00000316] mp4 private debug: | + mdat size 1332018939
[00000316] mp4 private debug: | + ??? size -356567942
[00000317] mp4 demuxer debug: ISO Media file (isom) version 0.
[00000317] mp4 demuxer error: MP4 plugin discarded (no moov box)
[00000317] ps demuxer warning: this does not look like an MPEG PS stream, continuing anyway
[00000178] main module debug: using demux2 module "ps"
[00000313] main input debug: looking for a subtitle file in /Volumes/MiniCat/TVFree/
[00000313] main input debug: `/Volumes/MiniCat/TVFree/Calais.mp4' successfully opened
[00000317] ps demuxer warning: garbage at input, trying to resync...
[00000317] ps demuxer warning: found sync code
[00000317] ps demuxer debug: es id=0xf1 format unknown
[00000317] ps demuxer warning: garbage at input, trying to resync...
[00000313] main input debug: EOF reached
[00000313] main input debug: closing input
[00000178] main module debug: unlocking module "ps"
[00000036] main module debug: unlocking module "access_file"
TIA
Jean-Denis