I noticed some strange differences between the embedded vbi data while doing video capture in MythTV (using mpegrecorder) and plain recordings from the prompt. Both capture the MPEG PS from /dev/video. MythTV just reads a block of data and dumps this into a ringbuffer file, so nothing fancy. Same happens when doing it from the prompt: 'cat /dev/video > test.mpg' but.... The MythTV ringbuffer file (still an MPEG PS) does misses some vbi packets (not all - irregular missed packets), while the file created with 'cat' contains all packets! The most annoying thing is that the missed packets contain subtitle information...
Both techniques use identical VBI settings (vbi service set, vbi packet size, vbi io size) and codec parameters (bitrate, framerate, etc) so this is not the reason. Has anyone an idea what causes this? Saw some issues on the -dev lists related to DMA and memcopy differences, but my knowledge on this is limited. Please advice. Martin ------------------------------------------------------- SF email is sponsored by - The IT Product Guide Read honest & candid reviews on hundreds of IT Products from real users. Discover which products truly live up to the hype. Start reading now. http://ads.osdn.com/?ad_id=6595&alloc_id=14396&op=click _______________________________________________ ivtv-devel mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/ivtv-devel
