[Libav-user] User-specified execute/execute2 function in mpeg2 video encoder

[Gavin Smith]

To simplify my problem, I've modified an existing FFmpeg code sample. My modified code sample generates a .ts file containing mp2v video (no audio), but I cannot figure out why parallel encoding will not work (well, the ffmpeg library will not call back into my custom execute callback funcs).  

https://pastebin.com/y1kae2fu

If you run the code sample and insert a debugger breakpoint in the custom 'execute'/'execute2' function, you will note that the user-defined functions are never called by the encoder even though parallel encoding is explicitly enabled.

Gavin. 
      From: Gavin Smith <gcs584-at-yahoo.com at ffmpeg.org>
 To: "libav-user at ffmpeg.org" <libav-user at ffmpeg.org> 
 Sent: Thursday, 1 June 2017, 15:29
 Subject: [Libav-user] User-specified execute/execute2 function in mpeg2 video encoder
   
I'm attempting to set the mpeg2video encoder to use the threads within my existing thread pool.  I'm encoding SD interlaced PAL content, but I cannot seem to get the encoder to callback into my user-defined execute function(s). To keep things simple, I have tried testing the callbacks with GDB before attempting to post the work to my thread pool.
I have attached a link to a code snippet to provide some insight on how the encoder is being configured.
https://pastebin.com/qLZ6ZYMy
Note: In the code snippet provided, the code detects that threads may be used in conjunction with slices.

Admittedly, there are a few fields which are linked, yet they do add for some confusion.  The trunk docs are a bit sparse on the first two (2) fields.  I may try update the docs if I can retrieve some additional information.  * AVCodecContext::thread_type
 * AVCodecContext::active_thread_type
 * AVCodec::capabilities

Any tips/suggestions would be much appreciated...

Gavin._______________________________________________
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