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  • FFmpeg 5 C api codec end of stream situation

    11 mars 2023, par Guanyuming He

    I'm new to FFmpeg api programming (I'm using version 5.1) and am learning from the documentation and official examples.

    


    In the documentation page about send/receive encoding and decoding API overview, end of stream situation is discussed briefly :

    


    


    End of stream situations. These require "flushing" (aka draining) the codec, as the codec might buffer multiple frames or packets internally for performance or out of necessity (consider B-frames). This is handled as follows :

    


    


    


    Instead of valid input, send NULL to the avcodec_send_packet() (decoding) or avcodec_send_frame() (encoding) functions. This will enter draining mode.
Call avcodec_receive_frame() (decoding)
or avcodec_receive_packet() (encoding) in a loop until AVERROR_EOF is returned. The functions will not return AVERROR(EAGAIN), unless you forgot to enter draining mode.
Before decoding can be resumed again, the codec has to be reset with avcodec_flush_buffers().

    


    


    As I understand it, when I get AVERROR_EOF, I have reached a special point where I need to drain buffered data from the codec and finally reset the codec with avcodec_flush_buffers(). Without doing it, I cannot continue decoding/encoding.

    


    Then I have some questions :

    


      

    1. If I received EOF when I already finished sending data (e.g. when after EOF is returned by av_read_frame()), how should I tell if it's really finished ?

      2. 


    2. The data returned from the receive_... functions during draining, should I take them as valid ?

      3. 


    


    I might have found answers to those in the official examples, but I'm not sure if the answer is universally true. I noticed that in some official examples, like in transcode_aac.c, draining is only done for the first EOF reached, and then after the second one is received, it is regarded that there are really nothing left. Any data received during draining is also written to the final output.

    


    I just wonder, Is it true for all multimedia files in ffmpeg ?

    


    I appreciate your response and time in advance. :)

    


  • Revision 066ed601a5 : Merge "Don't waste time partitioning skip superblocks."

    9 mars 2015, par Alex Converse

    Merge "Don’t waste time partitioning skip superblocks."

  • gdb and ffmpeg compilation

    10 mars 2013, par toutou0091

    I installed ffmpeg using the instructions of the web site ffmpeg : http://ffmpeg.org/trac/ffmpeg/wiki/UbuntuCompilationGuide, compilation works fine, they generates a file "ffmpeg_201207131721-git-1_amd64.deb " then, i excute " sudo dpkg-i ffmpeg_201207131721-git-1_amd64.deb". When I excute the command "ffmpeg-i-f toto.flv mp3-vn-acodec copy new_video.mp3" file "new_video. mp3" is well established. I would like to know what is the command "gdb" that I could use to find the file that have been consulted when i run the command "ffmpeg-i-f toto.flv mp3-vn-acodec copy new_video.mp3 "

    Thank you in advance

    Toufik

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