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Sur d’autres sites (15038)

  • avformat/tests/fifo_muxer : Fix memleak on error, fix API violation

    19 mars 2021, par Andreas Rheinhardt
    avformat/tests/fifo_muxer : Fix memleak on error, fix API violation

    The test program for the FIFO muxer allocates a buffer without padding
    
and wraps it into a packet via av_packet_from_data(). This is an API
    
violation. Furthermore, said buffer leaks in case av_packet_from_data()
    
fails. Fix both of these issues by using av_new_packet() instead.
    

    Reviewed-by : James Almer <jamrial@gmail.com>
    
Signed-off-by : Andreas Rheinhardt <andreas.rheinhardt@gmail.com>
    • [DH] libavformat/tests/fifo_muxer.c

  • How to properly abort av_seek_frame on FFmpeg ?

    5 mars 2021, par SuRGeoNix

    Normally, you wouldn't care aborting av_seek_frame as it would be really fast on a local file. However, in my case I use a custom AVIOContext for torrent streaming with custom read/seek functions and I'm not able to abort a single seek request !

    &#xA;

    I've already tried interrupt callbacks (they will not be called at all), some timeouts (rw_timeout/timeout etc.) but by checking FFmpeg's code didn't find anything at all. My last chance was to try to return on read/seek functions an error (I've tried AVERROR_EXIT) which causes even more problems (memory leaks).

    &#xA;

    The main issue is with Matroska formats that they need to resync (level-1) and they are trying to scan the whole file.

    &#xA;

    Unfortunately, I'm using C# .NET with FFmpeg.Autogen bindings which means that I don't have low-level access to play around. My workaround is to re-open the whole format context in case on seek abort (to ensure that the player will continues to play at least)

    &#xA;

    Hope you have a tip for me !

    &#xA;

    (By the way for some http/hls web formats interrupt callbacks are supported)

    &#xA;

  • avformat/wavenc : Fix leak and segfault on reallocation error

    22 février 2021, par Andreas Rheinhardt
    avformat/wavenc : Fix leak and segfault on reallocation error

    Up until now, the wav muxer used a reallocation of the form ptr =
    
av_realloc(ptr, size) ; that leaks upon error. Furthermore, if a
    
failed reallocation happened when writing the trailer, a segfault
    
would occur due to avio_write(NULL, size) because the muxer only
    
prints an error message upon allocation error, but does not return
    
the error.
    

    Moreover setting the pointer to the buffer to NULL on error seems to
    
be done on purpose in order to record that an error has occured so that
    
outputting the peak values is no longer attempted. This behaviour has
    
been retained by simply disabling whether peak data should be written
    
if an error occurs.
    

    Finally, the reallocation is now done once per peak block and not once
    
per peak block per channel ; it is also done with av_fast_realloc and not
    
with a linear size increase.
    

    Signed-off-by : Andreas Rheinhardt <andreas.rheinhardt@gmail.com>
    • [DH] libavformat/wavenc.c

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