LXF demuxer fails on new Leitch files

[Carl Lindqvist]

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.

[Carl Lindqvist]

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

[Carl Eugen Hoyos]

Complete, uncut console output missing.

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

[Carl Lindqvist]

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

[Carl Lindqvist]

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