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• How to replace avcodec_encode_audio2()/avcodec_encode_video2() with avcodec_send_frame() and avcodec_receive_packet() ?

  27 octobre 2020, par Optic_Ray

  In muxing example in link am attempting to use avcodec_send_frame() and avcodec_receive_packet() instead of avcodec_encode_audio2()/avcodec_encode_video2() as they are deprecated. In

  


    352     ret = avcodec_encode_audio2(c, &pkt, frame, &got_packet);
  353     if (ret < 0) {
  354         fprintf(stderr, "Error encoding audio frame: %s\n", av_err2str(ret));
  355         exit(1);
  356     }
  357 
  358     if (got_packet) {
  359         ret = write_frame(oc, &c->time_base, ost->st, &pkt);
  360         if (ret < 0) {
  361             fprintf(stderr, "Error while writing audio frame: %s\n",
  362                     av_err2str(ret));
  363             exit(1);
  364         }
  365     }
  366 
  367     return (frame || got_packet) ? 0 : 1;


  


  and in

  


    522     ret = avcodec_encode_video2(c, &pkt, frame, &got_packet);
  523     if (ret < 0) {
  524         fprintf(stderr, "Error encoding video frame: %s\n", av_err2str(ret));
  525         exit(1);
  526     }
  527 
  528     if (got_packet) {
  529         ret = write_frame(oc, &c->time_base, ost->st, &pkt);
  530     } else {
  531         ret = 0;
  532     }
  533 
  534     if (ret < 0) {
  535         fprintf(stderr, "Error while writing video frame: %s\n", av_err2str(ret));
  536         exit(1);
  537     }
  538 
  539     return (frame || got_packet) ? 0 : 1;


  


  What to assign got_packet variable with when using avcodec_send_frame() and avcodec_receive_packet() functions and how to change the code if I do ?. I have tried this so far

  


  ret = avcodec_send_frame(c, frame);
if (ret < 0) {
    fprintf(stderr, "Error sending the frame to the audio encoder\n");
    exit(1);
}
if (ret = 0) {
    got_packet = avcodec_receive_packet(c, &pkt);
    if (got_packet == AVERROR(EAGAIN) || got_packet == AVERROR_EOF){
        fprintf(stderr, "Error receiving packet\n");
        return -1;}
    else if (got_packet < 0) {
        fprintf(stderr, "Error encoding audio frame\n");
        exit(1);
    }
    ret1 = write_frame(oc, &c->time_base, ost->st, &pkt);
    if (ret1 < 0) {
        fprintf(stderr, "Error while writing audio frame: %s\n",
                av_err2str(ret1));
        exit(1);
    }
    av_packet_unref(&pkt);
}
return (frame || got_packet) ? 0 : 1;


  


  but isn't working and am having hard time getting it to work.

  


• Increase the bitrate tolerance of ffmpeg for creating screenshots of a movie

  21 septembre 2012, par rekire

  I'm getting the error bitrate tolerance too small for bitrate so far no problem. I know that there are several switches to increase that but nothing works.

  ffmpeg -y -r 1/30 -b:v 999999k -bt 999999k -maxrate 999999k -i in.flv out%03d.jpg

  The source of that commandline is directly from ffmpeg. But that crashes :

  ffmpeg version N-44123-g5d55830 Copyright (c) 2000-2012 the FFmpeg developers
  
    built on Sep  2 2012 20:23:29 with gcc 4.7.1 (GCC)
  
    [...]
  
  Input #0, flv, from 'in.flv':
  
    Duration: 00:05:00.13, start: 0.000000, bitrate: 259 kb/s
  
      Stream #0:0: Video: flv1, yuv420p, 320x240, 1k tbr, 1k tbn, 1k tbc
  
      Stream #0:1: Audio: nellymoser, 22050 Hz, mono, s16
  
  [mjpeg @ 04356860] bitrate tolerance too small for bitrate
  
  [mjpeg @ 04317540] ff_frame_thread_encoder_init failed
  
  Output #0, image2, to 'out%03d.jpg':
  
      Stream #0:0: Video: mjpeg, yuvj420p, 320x240, q=2-31, 200 kb/s, 90k tbn, 0.03 tbc
  
  Stream mapping:
  
    Stream #0:0 -> #0:0 (flv -> mjpeg)
  
  Error while opening encoder for output stream #0:0 - maybe incorrect parameters such as bit_rate, rate, width or height

  Some ideas what I'm doing wrong ?

• [h264_nvenc : InitializeEncoder failed:supported only with separate color plane on this architecture

  4 janvier 2021, par gpuguy

  I am learning ffmpeg for the first time. What I want is to see how it performs on CPU and on GPU when it comes to transcoding.

  


  My machine is having a GT640 GPU card (GT640 is a Kepler card) and I am running a windows 7 , 64bit.
I issue the following command :

  


  ffmpeg -i lec_2.mp4 -c:v h264_nvenc -profile high444p -pixel_format yuv444p -preset default output.mp4


  


  But I am getting following errors :

  


  [h264_nvenc @ 0000000000363a80] The selected preset is deprecated. Use p1 to p7
+ -tune or fast/medium/slow.
[h264_nvenc @ 0000000000363a80] InitializeEncoder failed: invalid param (8): 444
 is supported only with separate color plane on this architecture.
Error initializing output stream 0:0 -- Error while opening encoder for output s
tream #0:0 - maybe incorrect parameters such as bit_rate, rate, width or height
[aac @ 0000000000365980] Qavg: 18941.322
[aac @ 0000000000365980] 2 frames left in the queue on closing
Conversion failed!


  


  My questions are :

  


  


  1. From this output can I assume that nvenc is supported on my card since it does not complaint of no nvenc supported GPU ?

     


  


  2. How should the above command be modified so as to make it work correctly