Recherche avancée

Sur d’autres sites (4673)

• Remove portion of some frames from a video

  21 janvier 2020, par FlafyMation

  Here is what I’m trying to do :
  Imagine a video with 10 frames (0 = 1 frame)

  0 0 0 0 0 0 0 0 0 0

  with some frames selected(1 = 1 selected frame)

  0 1 1 1 0 0 0 0 0 0

  and the end results should be this(all selected frames got removed from the video)

  0 0 0 0 0 0 0

  this is what I’m trying to do in python(with frames not times). Does anybody knows how I can do that ?

• FFmpeg : av_interleaved_write_frame doesn't detect failure for TLS output

  15 mars 2017, par DanielB6

  How can I detect failure from av_interleaved_write_frame/av_write_frame when the output uses TLS and the connection fails ? Both functions continue to return 0 after the destination becomes unavailable. When TLS isn’t used, the functions detect the failure immediately and return -ve return codes.

  TLS output :

  av_interleaved_write_frame st.tb=90000, result=0

  Non-TLS output :

  av_interleaved_write_frame failed result=-32 - Broken pipe

  This behaviour can also be demonstrated using the command-line tool.

  Expected Result for plain connection - Connection failure terminates program :

  $ ffmpeg -rtsp_transport tcp -i rtsp://:554... -vcodec copy -an -f rtsp "rtsp://:1935..."
  
  ffmpeg version N-68044-g9f9440b Copyright (c) 2000-2014 the FFmpeg developers
  
    built on Nov 27 2014 03:13:44 with gcc 4.9.2 (GCC)
  
    configuration: --enable-gpl --enable-version3 --disable-w32threads --enable-avisynth --enable-bzlib --enable-fontconfig --enable-frei0r --enable-gnutls --enable-iconv --enable-libass --enable-libbluray --enable-libbs2b --enable-libcaca --enable-libfreetype --enable-libgme --enable-libgsm --enable-libilbc --enable-libmodplug --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg --enable-libopus --enable-librtmp --enable-libschroedinger --enable-libsoxr --enable-libspeex --enable-libtheora --enable-libtwolame --enable-libvidstab --enable-libvo-aacenc --enable-libvo-amrwbenc --enable-libvorbis --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxavs --enable-libxvid --enable-decklink --enable-zlib
  
    libavutil      54. 15.100 / 54. 15.100
  
    libavcodec     56. 13.100 / 56. 13.100
  
    libavformat    56. 15.100 / 56. 15.100
  
    libavdevice    56.  3.100 / 56.  3.100
  
    libavfilter     5.  2.103 /  5.  2.103
  
    libswscale      3.  1.101 /  3.  1.101
  
    libswresample   1.  1.100 /  1.  1.100
  
    libpostproc    53.  3.100 / 53.  3.100
  
  Input #0, rtsp, from 'rtsp://:554...':
  
    Metadata:
  
      title           : Media Presentation
  
      comment         : <comment>
  
    Duration: N/A, start: 0.011000, bitrate: N/A
  
      Stream #0:0: Video: h264 (High), yuv420p, 1920x1080, 30 tbr, 90k tbn, 180k tbc
  
      Stream #0:1: Data: none
  
  Output #0, rtsp, to 'rtsp://:1935...':
  
    Metadata:
  
      title           : Media Presentation
  
      comment         : <comment>
  
      encoder         : Lavf56.15.100
  
      Stream #0:0: Video: h264, yuv420p, 1920x1080, q=2-31, 90k tbn, 90k tbc
  
  Stream mapping:
  
    Stream #0:0 -> #0:0 (copy)
  
  Press [q] to stop, [?] for help
  
  [rtsp @ 0000000004d4e940] Non-monotonous DTS in output stream 0:0; previous: 0, current: 0; changing to 1. This may result in incorrect timestamps in the output file.
  
  av_interleaved_write_frame(): Broken pipe00:00:15.71 bitrate=N/A
  
  frame=  476 fps= 33 q=-1.0 Lsize=N/A time=00:00:15.77 bitrate=N/A
  
  video:2178kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: unknown
  
  Conversion failed!
  
  $
  
  </comment></comment>

  Unexpected result for TLS connection - Program continues to run, although it knows something is wrong :

  $ ffmpeg -rtsp_transport tcp -i rtsp://:554... -vcodec copy -an -f rtsp "rtsps://:443..."
  
  ffmpeg version N-68044-g9f9440b Copyright (c) 2000-2014 the FFmpeg developers
  
    built on Nov 27 2014 03:13:44 with gcc 4.9.2 (GCC)
  
    configuration: --enable-gpl --enable-version3 --disable-w32threads --enable-avisynth --enable-bzlib --enable-fontconfig --enable-frei0r --enable-gnutls --enable-iconv --enable-libass --enable-libbluray --enable-libbs2b --enable-libcaca --enable-libfreetype --enable-libgme --enable-libgsm --enable-libilbc --enable-libmodplug --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg --enable-libopus --enable-librtmp --enable-libschroedinger --enable-libsoxr --enable-libspeex --enable-libtheora --enable-libtwolame --enable-libvidstab --enable-libvo-aacenc --enable-libvo-amrwbenc --enable-libvorbis --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxavs --enable-libxvid --enable-decklink --enable-zlib
  
    libavutil      54. 15.100 / 54. 15.100
  
    libavcodec     56. 13.100 / 56. 13.100
  
    libavformat    56. 15.100 / 56. 15.100
  
    libavdevice    56.  3.100 / 56.  3.100
  
    libavfilter     5.  2.103 /  5.  2.103
  
    libswscale      3.  1.101 /  3.  1.101
  
    libswresample   1.  1.100 /  1.  1.100
  
    libpostproc    53.  3.100 / 53.  3.100
  
  Input #0, rtsp, from 'rtsp://:554...':
  
    Metadata:
  
      title           : Media Presentation
  
      comment         : <comment>
  
    Duration: N/A, start: 0.025000, bitrate: N/A
  
      Stream #0:0: Video: h264 (High), yuv420p, 1920x1080, 30 tbr, 90k tbn, 180k tbc
  
      Stream #0:1: Data: none
  
  Output #0, rtsp, to 'rtsps://:443...':
  
    Metadata:
  
      title           : Media Presentation
  
      comment         : <comment>
  
      encoder         : Lavf56.15.100
  
      Stream #0:0: Video: h264, yuv420p, 1920x1080, q=2-31, 90k tbn, 90k tbc
  
  Stream mapping:
  
    Stream #0:0 -> #0:0 (copy)
  
  Press [q] to stop, [?] for help
  
  [rtsp @ 0000000002d5aa20] Non-monotonous DTS in output stream 0:0; previous: 0, current: 0; changing to 1. This may result in incorrect timestamps in the output file.
  
  [tls @ 00000000056adc00] Error in the push function. bitrate=N/A
  
  [tls @ 00000000056adc00] The specified session has been invalidated for some reason.
  
      Last message repeated 2 times
  
  [tls @ 00000000056adc00] The specified session has been invalidated for some reason.
  
      Last message repeated 31 times
  
  [tls @ 00000000056adc00] The specified session has been invalidated for some reason.
  
      Last message repeated 89 times
  
  [tls @ 00000000056adc00] The specified session has been invalidated for some reason.
  
      Last message repeated 30 times
  
  [tls @ 00000000056adc00] The specified session has been invalidated for some reason.
  
      Last message repeated 92 times
  
  [tls @ 00000000056adc00] The specified session has been invalidated for some reason.
  
      Last message repeated 29 times
  
  [tls @ 00000000056adc00] The specified session has been invalidated for some reason.
  
      Last message repeated 90 times
  
  [tls @ 00000000056adc00] The specified session has been invalidated for some reason.
  
      Last message repeated 29 times
  
  [tls @ 00000000056adc00] The specified session has been invalidated for some reason.
  
      Last message repeated 92 times
  
  ...
  
  </comment></comment>

  I need to be able to detect the failure in av_interleaved_write_frame so that I can re-initiate the connection.

• Can't split 24bit flac files on the command line [closed]

  21 mars 2023, par Martin

  I am trying to export a 24bit flac file in my ubuntu terminal. I've tried two different methods, but neither work.

  


  Method 1 : shntool

  


  when I run this command :
shntool split -f times.cue -O always -o lowq_full_silence.flac

  


  where lowq_full_silence.flac was rendered in audacity as a flac file with level=0 and bit depth=16 bit, my command works.

  


  but if i run this command :

  


  shntool split -f times.cue -O always -o full_hq.flac

  


  where full_hq.flac has level=8 and bit depth=24 bit
The command fails :

  


  shntool [split]: warning: unsupported format 0xfffe (Unknown) while processing file: [full_hq.flac]
shntool [split]: error: cannot continue due to error(s) shown above


  


  https://bugs.launchpad.net/ubuntu/+source/shntool/+bug/2000794

  


  Method 2 : ffmpeg

  


  Trying to split the flac file with comma separated 'split points' input

  


  ffmpeg -i "full_hq.flac" -c copy -map 0 -f segment -segment_times "22,441,556,559" "%d_output.flac"

  


  But the output from this ffmpeg command has broken length metadata :

  


  https://trac.ffmpeg.org/ticket/4905

  


  Is there a better way to split a high quality 24bit flac file into individual segments, where each exported segment file has correct length metadata ?

  


  Files :
https://file.io/lvGTUEgQArb7