Package: ffmpeg Version: 0.cvs20060823-8 I am trying to encode a video stream using ffmpeg (or indeed ffmpeg2theora). The input data to be encoded comes from a series of netpbm runes, one small shell scriptlet per frame.
Ideally I would like to use the `image2pipe' format but this has a critical bug which AFAICT renders it unuseable: I saw a number of messages about `buffer underruns' and some other messages and the resulting output was unplayable. I used ffmpeg -f image2pipe -i pipe:.ppm ... and variations thereon, without success. ffmpeg2theora didn't work either. I straced ffmpeg and found that it was occasionally getting short reads from the input pipe. That is, read(2) would sometimes return a smaller number than it had asked for. This is expected behaviour. I suspect (but I have no direct evidence) that ffmpeg is mishandling this case. I rearranged my program to use -f image2 and then everything worked fine, so I know that it's the handling of piped input that is the problem. I'm afraid I don't have any more the version of my processing script which I can use to reproduce this error but a quick web search suggests other people sometimes have the same problem. I can try to produce a test case if you really want but I think my first route to debugging at this point would be to check the code for the mistake I suspect as I describe above. Ian. -- To UNSUBSCRIBE, email to [EMAIL PROTECTED] with a subject of "unsubscribe". Trouble? Contact [EMAIL PROTECTED]
