[Libav-user] any way to interrupt avcodec_decode_video2 ?

[Don Moir]

From: ???? ?? 
To: This list is about using libavcodec, libavformat, libavutil,libavdevice and libavfilter. 
Sent: Tuesday, December 31, 2013 5:24 AM
Subject: Re: [Libav-user] any way to interrupt avcodec_decode_video2 ?


>What do you mean by "waiting"? 
>If you're calling this api on a different thread, why can't you terminate the thread?
>If you're calling it from your main thread, there's nothing your app can do until the function returns, unless they implement some callbacks in the middle of the execution.


>Best of luck!

I allow for proper cleanup and no telling what state ffmpeg would be in if I just up and terminated the thread. It's in the mist of decoding and waiting for return allows me to free packet its decoding etc.

Another thread waits on it normally waiting to seek or exit.

Best thing would be interrupt callback.

---- Original Message ----- 
  From: ???? ?? 
  To: This list is about using libavcodec, libavformat, libavutil,libavdevice and libavfilter. 
  Sent: Tuesday, December 31, 2013 5:24 AM
  Subject: Re: [Libav-user] any way to interrupt avcodec_decode_video2 ?


  What do you mean by "waiting"?
  If you're calling this api on a different thread, why can't you terminate the thread?
  If you're calling it from your main thread, there's nothing your app can do until the function returns, unless they implement some callbacks in the middle of the execution.


  Best of luck!



  On Mon, Dec 16, 2013 at 8:48 AM, Don Moir <donmoir at comcast.net> wrote:


    ----- Original Message ----- From: "Carl Eugen Hoyos" <cehoyos at ag.or.at>
    To: <libav-user at ffmpeg.org>
    Sent: Tuesday, December 31, 2013 4:08 AM

    Subject: Re: [Libav-user]any way to interrupt avcodec_decode_video2 ?



      Don Moir <donmoir at ...> writes:


        Since app is timeline oriented, trying to keep seek time
        down to minimum and if avcodec_decode_video2 has been
        called, seems there is no way out until its finished
        and this decoding time can delay a new seek attempt.


      Are you looking for CODEC_FLAG2_SHOW_ALL?

      Carl Eugen



    No. I can easily check between calls to avcodec_decode_video2 but once its called you are stuck until it returns. Would be nice to be able to interrupt it for quicker seeking and to end 'the' video more quickly. Doesn't matter too much for a simple player app, but I have things on timelines and also video coming and going quicky. Things are time corrected to a timeline but the more I can reduce impact from things like this the better off we are.

    A simple seek to zero is quick, but if I have to wait on avcodec_decode_video2 to return, then its slower and can be quite slow. I don't mean finish as in the flag (gotframe) to avcodec_decode_video2, but just waiting on it to return period.


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