Opened 5 years ago

Closed 4 years ago

#656 closed defect (fixed)

LXF demuxer fails on new Leitch files

Reported by: Nioreh Owned by:
Priority: normal Component: avformat
Version: git-master Keywords: lxf
Cc: Blocked By:
Blocking: Reproduced by developer: yes
Analyzed by developer: no


FFmpeg/avformat fails to read files produced by newer Leitch/Harris? servers (*.lxf). According to what I've learned, the file header and packet headers have grown a few bytes in the new version. The byte count for the headers have been updated, but I suspect that the lxf demuxer in avformat has these values hard coded. This is the output of FFmpeg:

[lxf @ 020F9F40] checksum error
[lxf @ 020F9F40] expected 120 B size header, got 0

All the samples I have are very big (3GB+), so I can't send the files easily.

Attachments (2)

cut.lxf (2.4 MB) - added by cehoyos 5 years ago.
New+LXF+Format.pdf (169.9 KB) - added by cehoyos 5 years ago.

Change History (8)

comment:1 Changed 5 years ago by Nioreh

The values for header size and packet header size seem to indeed be hard coded. This should be read from the files themselves. The following is from libavformat/lxfdec.c:

00026 #define LXF_PACKET_HEADER_SIZE 60
00027 #define LXF_HEADER_DATA_SIZE 120

comment:2 Changed 5 years ago by cehoyos

  • Keywords demuxer packet header removed

Complete, uncut console output missing.

Without a sample, this is very unlikely to get fixed.

comment:3 Changed 5 years ago by Nioreh

Ok, here is the full output of ffprobe on a new lxf:

ffprobe version N-34704-g985e768, Copyright (c) 2007-2011 the FFmpeg developers

built on Nov 11 2011 01:46:59 with gcc 4.6.2
configuration: --enable-gpl --enable-version3 --disable-w32threads --enable-ru

ntime-cpudetect --enable-avisynth --enable-bzlib --enable-frei0r --enable-libope
ncore-amrnb --enable-libopencore-amrwb --enable-libfreetype --enable-libgsm --en
able-libmp3lame --enable-libopenjpeg --enable-librtmp --enable-libschroedinger -
-enable-libspeex --enable-libtheora --enable-libvo-aacenc --enable-libvo-amrwben
c --enable-libvorbis --enable-libvpx --enable-libx264 --enable-libxavs --enable-
libxvid --enable-zlib

libavutil 51. 24. 1 / 51. 24. 1
libavcodec 53. 31. 0 / 53. 31. 0
libavformat 53. 20. 0 / 53. 20. 0
libavdevice 53. 4. 0 / 53. 4. 0
libavfilter 2. 47. 2 / 2. 47. 2
libswscale 2. 1. 0 / 2. 1. 0
libpostproc 51. 2. 0 / 51. 2. 0

[lxf @ 020E8CE0] checksum error
[lxf @ 020E8CE0] expected 120 B size header, got 0
y:\lxf\CP261167.lxf: Invalid data found when processing input

comment:4 Changed 5 years ago by Nioreh

I will see if I can get hold of a small sample file.

Changed 5 years ago by cehoyos

Changed 5 years ago by cehoyos

comment:5 Changed 5 years ago by cehoyos

  • Reproduced by developer set
  • Status changed from new to open

comment:6 Changed 4 years ago by reimar

  • Resolution set to fixed
  • Status changed from open to closed
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