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• libswresample : swr_convert() returns empty buffer

  11 septembre 2019, par Герман Лиманський

  I try to convert audio in format AV_SAMPLE_FMT_S32. I use swr_convert(), but out buffer still empty.

  // frame is decoded frame, rframe - is empty frame(out buffer)

      if (!main_context->resampler) {
  
                      main_context->resampler = 
  
                      swr_alloc_set_opts(main_context->resampler,
  
                      AV_CH_LAYOUT_STEREO,                    // output
  
                      AV_SAMPLE_FMT_S32,                      // output
  
                      44100,                                  // output
  
                      audio_codec_context->channel_layout,    // input
  
                      audio_codec_context->sample_fmt,        // input
  
                      audio_codec_context->sample_rate,       // input
  
                      0,
  
                      nullptr);
  
                  swr_init(main_context->resampler);
  
  
  
              }
  
  
  
              //int in_samples = frame->nb_samples;
  
              int out_samples = av_rescale_rnd(swr_get_delay(
  
                  main_context->resampler, 44100) + 44100,
  
                  44100,
  
                  44100,
  
                  AV_ROUND_UP);
  
  
  
              size_t buffSize = av_samples_alloc(rframe->data, NULL,audio_codec_context->channels, out_samples, AV_SAMPLE_FMT_S32, 0);
  
              int len = swr_convert(main_context->resampler, rframe->data, frame->nb_samples, (const uint8_t * *)frame->data, frame->nb_samples);
  
  //here.. rframe->data should have some data, but its empty
  
              while (len > 0)
  
              {
  
                  size_t size_ = rframe->nb_samples * av_get_bytes_per_sample(AV_SAMPLE_FMT_S32);
  
                  main_context->audio_buf.write(rframe->data[0], size_, 1);
  
  
  
                  len = swr_convert(main_context->resampler, rframe->data, frame->nb_samples, NULL, NULL);
  
              }

• Using ffmpeg to record screen returns corrupted file

  8 août 2020, par odddollar

  I'm using ffmpeg and python to record my desktop screen. I've got it working so that when I input a shortcut, it starts recording. Then I use .terminate() on the subprocess to stop recording. When outputting to an mp4, this corrupts the file and makes it unreadable. I can output the file as an flv or avi and it doesn't get corrupted, but then the video doesn't contain time/duration data, something I need.

  


  Is there a way I can gracefully stop the recording when outputting an mp4 ?
Or is there a way I can include the time/duration data in the flv/avi ?

  


  import keyboard
import os
from subprocess import Popen

class Main:
    def __init__(self):
        self.on = False

    def main(self):
        if not self.on:
            if os.path.isfile("output.mp4"):
                os.remove("output.mp4")

            self.process = Popen('ffmpeg -f gdigrab -framerate 30 -video_size 1920x1080 -i desktop -b:v 5M output.mp4')
            self.on = True
        else:
            self.process.terminate()

            self.on = False

run = Main()
keyboard.add_hotkey("ctrl+shift+g", lambda:run.main())

keyboard.wait()


  


• FFMpeg returns error : Unrecognized option 'master_pl_name'

  14 février 2021, par jonatasos

  I used this command (described at the processing message bellow) on my application several times before and always worked well. Now returns that error.

  


  '/usr/bin/ffmpeg' '-y' '-threads' '12' '-i' 
'/home/vagrant/code/myapp/storage/videos/videos_disk/a3.mp4' '-map' '0' '-vcodec' 'libx264' 
'-b:v' '500k' '-g' '48' '-hls_playlist_type' 'vod' '-hls_time' '10' '-hls_segment_filename' 
'/home/vagrant/code/myapp/storage/app/public/test_0_500_%05d.ts' '-master_pl_name' 
'master_playlist_guide_0.m3u8' '-acodec' 'aac' '-b:a' '128k' 
'/home/vagrant/code/myapp/storage/app/public/test_0_500.m3u8' '-map' '0' '-vcodec' 
'libx264' '-b:v' '1500k' '-g' '48' '-hls_playlist_type' 'vod' '-hls_time' '10' '-hls_segment_filename' 
'/home/vagrant/code/myapp/storage/app/public/test_1_1500_%05d.ts' '-master_pl_name' 
'master_playlist_guide_1.m3u8' '-acodec' 'aac' '-b:a' '128k' 
'/home/vagrant/code/myapp/storage/app/public/test_1_1500.m3u8' '-map' '0' '-vcodec' 
'libx264' '-b:v' '3000k' '-g' '48' '-hls_playlist_type' 'vod' '-hls_time' '10' '-hls_segment_filename' 
'/home/vagrant/code/myapp/storage/app/public/test_2_3000_%05d.ts' '-master_pl_name' 
'master_playlist_guide_2.m3u8' '-acodec' 'aac' '-b:a' '128k' 
'/home/vagrant/code/myapp/storage/app/public/test_2_3000.m3u8'


  


  (single line:) '/usr/bin/ffmpeg' '-y' '-threads' '12' '-i' '/home/vagrant/code/myapp/storage/videos/videos_disk/a3.mp4' '-map' '0' '-vcodec' 'libx264' '-b:v' '500k' '-g' '48' '-hls_playlist_type' 'vod' '-hls_time' '10' '-hls_segment_filename' '/home/vagrant/code/myapp/storage/app/public/test_0_500_%05d.ts' '-master_pl_name' 'master_playlist_guide_0.m3u8' '-acodec' 'aac' '-b:a' '128k' '/home/vagrant/code/myapp/storage/app/public/test_0_500.m3u8' '-map' '0' '-vcodec' 'libx264' '-b:v' '1500k' '-g' '48' '-hls_playlist_type' 'vod' '-hls_time' '10' '-hls_segment_filename' '/home/vagrant/code/myapp/storage/app/public/test_1_1500_%05d.ts' '-master_pl_name' 'master_playlist_guide_1.m3u8' '-acodec' 'aac' '-b:a' '128k' '/home/vagrant/code/myapp/storage/app/public/test_1_1500.m3u8' '-map' '0' '-vcodec' 'libx264' '-b:v' '3000k' '-g' '48' '-hls_playlist_type' 'vod' '-hls_time' '10' '-hls_segment_filename' '/home/vagrant/code/myapp/storage/app/public/test_2_3000_%05d.ts' '-master_pl_name' 'master_playlist_guide_2.m3u8' '-acodec' 'aac' '-b:a' '128k' '/home/vagrant/code/myapp/storage/app/public/test_2_3000.m3u8':



  


  This is the error returned :

  


   ffmpeg version 3.4.8-0ubuntu0.2 Copyright (c) 2000-2020 the FFmpeg developers
  built with gcc 7 (Ubuntu 7.5.0-3ubuntu1~18.04)
  configuration: --prefix=/usr --extra-version=0ubuntu0.2 --toolchain=hardened --libdir=/usr/lib/x86_64-linux-gnu --incdir=/usr/include/x86_64-linux-gnu --enable-gpl --disable-stripping --enable-avresample --enable-avisynth --enable-gnutls --enable-ladspa --enable-libass --enable-libbluray --enable-libbs2b --enable-libcaca --enable-libcdio --enable-libflite --enable-libfontconfig --enable-libfreetype --enable-libfribidi --enable-libgme --enable-libgsm --enable-libmp3lame --enable-libmysofa --enable-libopenjpeg --enable-libopenmpt --enable-libopus --enable-libpulse --enable-librubberband --enable-librsvg --enable-libshine --enable-libsnappy --enable-libsoxr --enable-libspeex --enable-libssh --enable-libtheora --enable-libtwolame --enable-libvorbis --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx265 --enable-libxml2 --enable-libxvid --enable-libzmq --enable-libzvbi --enable-omx --enable-openal --enable-opengl --enable-sdl2 --enable-libdc1394 --enable-libdrm --enable-libiec61883 --enable-chromaprint --enable-frei0r --enable-libopencv --enable-libx264 --enable-shared
  libavutil      55. 78.100 / 55. 78.100
  libavcodec     57.107.100 / 57.107.100
  libavformat    57. 83.100 / 57. 83.100
  libavdevice    57. 10.100 / 57. 10.100
  libavfilter     6.107.100 /  6.107.100
  libavresample   3.  7.  0 /  3.  7.  0
  libswscale      4.  8.100 /  4.  8.100
  libswresample   2.  9.100 /  2.  9.100
  libpostproc    54.  7.100 / 54.  7.100
Unrecognized option 'master_pl_name'.
Error splitting the argument list: Option not found


  


  I`ve reinstalled the ffmpeg, also tested in a virtual machine and the same error happens.

  


  Live server : CentOS 7 / Apache2 / PHP-fpm 7.3 ;
Virtual machine : Ubuntu 20.04 / nginx / PHP-fpm 7.4.5

  


  I really have no clue about what to do about it now.