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• Get Timecode from MP4 generated in Adobe Premiere / Encoder in Python and FFMPEG

  3 novembre 2019, par russellaugust

  I’m writing a script that needs to either convert or re-container an MP4 as an MOV with timecode.

  I have an MP4 generated from Adobe Premiere. If I bring that file back into Premiere, I have timecode. I can see it so I know it is there.

  I can’t seem to extract the timecode track from the MP4. I’ve looked everywhere online and found some discussions around it, but no actual success in extracting the timecode.

  I’ve been using ffprobe to see if there’s any mention of the timecode in the MP4, but having no luck. I’ve tried PyMediaInfo with no success.

  Here’s what ffprobe shows :

  ffprobe version 4.2.1 Copyright (c) 2007-2019 the FFmpeg developers
  
    built with Apple clang version 11.0.0 (clang-1100.0.33.8)
  
    configuration: --prefix=/usr/local/Cellar/ffmpeg/4.2.1_1 --enable-shared --enable-pthreads --enable-version3 --enable-avresample --cc=clang --host-cflags='-I/Library/Java/JavaVirtualMachines/adoptopenjdk-13.jdk/Contents/Home/include -I/Library/Java/JavaVirtualMachines/adoptopenjdk-13.jdk/Contents/Home/include/darwin -fno-stack-check' --host-ldflags= --enable-ffplay --enable-gnutls --enable-gpl --enable-libaom --enable-libbluray --enable-libmp3lame --enable-libopus --enable-librubberband --enable-libsnappy --enable-libtesseract --enable-libtheora --enable-libvidstab --enable-libvorbis --enable-libvpx --enable-libx264 --enable-libx265 --enable-libxvid --enable-lzma --enable-libfontconfig --enable-libfreetype --enable-frei0r --enable-libass --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg --enable-librtmp --enable-libspeex --enable-libsoxr --enable-videotoolbox --disable-libjack --disable-indev=jack
  
    libavutil      56. 31.100 / 56. 31.100
  
    libavcodec     58. 54.100 / 58. 54.100
  
    libavformat    58. 29.100 / 58. 29.100
  
    libavdevice    58.  8.100 / 58.  8.100
  
    libavfilter     7. 57.100 /  7. 57.100
  
    libavresample   4.  0.  0 /  4.  0.  0
  
    libswscale      5.  5.100 /  5.  5.100
  
    libswresample   3.  5.100 /  3.  5.100
  
    libpostproc    55.  5.100 / 55.  5.100
  
  Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'demo_SequenceV3.mp4':
  
    Metadata:
  
      major_brand     : mp42
  
      minor_version   : 0
  
      compatible_brands: mp42mp41
  
      creation_time   : 2019-11-01T23:34:45.000000Z
  
    Duration: 00:00:27.69, start: 0.000000, bitrate: 10463 kb/s
  
      Stream #0:0(eng): Video: h264 (Main) (avc1 / 0x31637661), yuv420p(tv, bt709), 2304x1152 [SAR 1:1 DAR 2:1], 10142 kb/s, 23.98 fps, 23.98 tbr, 24k tbn, 48k tbc (default)
  
      Metadata:
  
        creation_time   : 2019-11-01T23:34:45.000000Z
  
        handler_name    : ?Mainconcept Video Media Handler
  
        encoder         : AVC Coding
  
      Stream #0:1(eng): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 317 kb/s (default)
  
      Metadata:
  
        creation_time   : 2019-11-01T23:34:46.000000Z
  
        handler_name    : #Mainconcept MP4 Sound Media Handler
  
  [STREAM]
  
  index=0
  
  codec_name=h264
  
  codec_long_name=H.264 / AVC / MPEG-4 AVC / MPEG-4 part 10
  
  profile=Main
  
  codec_type=video
  
  codec_time_base=1001/48000
  
  codec_tag_string=avc1
  
  codec_tag=0x31637661
  
  width=2304
  
  height=1152
  
  coded_width=2304
  
  coded_height=1152
  
  has_b_frames=0
  
  sample_aspect_ratio=1:1
  
  display_aspect_ratio=2:1
  
  pix_fmt=yuv420p
  
  level=50
  
  color_range=tv
  
  color_space=bt709
  
  color_transfer=bt709
  
  color_primaries=bt709
  
  chroma_location=left
  
  field_order=unknown
  
  timecode=N/A
  
  refs=1
  
  is_avc=true
  
  nal_length_size=4
  
  id=N/A
  
  r_frame_rate=24000/1001
  
  avg_frame_rate=24000/1001
  
  time_base=1/24000
  
  start_pts=0
  
  start_time=0.000000
  
  duration_ts=663663
  
  duration=27.652625
  
  bit_rate=10142082
  
  max_bit_rate=N/A
  
  bits_per_raw_sample=8
  
  nb_frames=663
  
  nb_read_frames=N/A
  
  nb_read_packets=N/A
  
  DISPOSITION:default=1
  
  DISPOSITION:dub=0
  
  DISPOSITION:original=0
  
  DISPOSITION:comment=0
  
  DISPOSITION:lyrics=0
  
  DISPOSITION:karaoke=0
  
  DISPOSITION:forced=0
  
  DISPOSITION:hearing_impaired=0
  
  DISPOSITION:visual_impaired=0
  
  DISPOSITION:clean_effects=0
  
  DISPOSITION:attached_pic=0
  
  DISPOSITION:timed_thumbnails=0
  
  TAG:creation_time=2019-11-01T23:34:45.000000Z
  
  TAG:language=eng
  
  TAG:handler_name=Mainconcept Video Media Handler
  
  TAG:encoder=AVC Coding
  
  [/STREAM]
  
  [STREAM]
  
  index=1
  
  codec_name=aac
  
  codec_long_name=AAC (Advanced Audio Coding)
  
  profile=LC
  
  codec_type=audio
  
  codec_time_base=1/48000
  
  codec_tag_string=mp4a
  
  codec_tag=0x6134706d
  
  sample_fmt=fltp
  
  sample_rate=48000
  
  channels=2
  
  channel_layout=stereo
  
  bits_per_sample=0
  
  id=N/A
  
  r_frame_rate=0/0
  
  avg_frame_rate=0/0
  
  time_base=1/48000
  
  start_pts=0
  
  start_time=0.000000
  
  duration_ts=1327326
  
  duration=27.652625
  
  bit_rate=317375
  
  max_bit_rate=335623
  
  bits_per_raw_sample=N/A
  
  nb_frames=1298
  
  nb_read_frames=N/A
  
  nb_read_packets=N/A
  
  DISPOSITION:default=1
  
  DISPOSITION:dub=0
  
  DISPOSITION:original=0
  
  DISPOSITION:comment=0
  
  DISPOSITION:lyrics=0
  
  DISPOSITION:karaoke=0
  
  DISPOSITION:forced=0
  
  DISPOSITION:hearing_impaired=0
  
  DISPOSITION:visual_impaired=0
  
  DISPOSITION:clean_effects=0
  
  DISPOSITION:attached_pic=0
  
  DISPOSITION:timed_thumbnails=0
  
  TAG:creation_time=2019-11-01T23:34:46.000000Z
  
  TAG:language=eng
  
  TAG:handler_name=#Mainconcept MP4 Sound Media Handler
  
  [/STREAM]
  
  [FORMAT]
  
  filename=demo_SequenceV3.mp4
  
  nb_streams=2
  
  nb_programs=0
  
  format_name=mov,mp4,m4a,3gp,3g2,mj2
  
  format_long_name=QuickTime / MOV
  
  start_time=0.000000
  
  duration=27.690667
  
  size=36216937
  
  bit_rate=10463290
  
  probe_score=100
  
  TAG:major_brand=mp42
  
  TAG:minor_version=0
  
  TAG:compatible_brands=mp42mp41
  
  TAG:creation_time=2019-11-01T23:34:45.000000Z
  
  [/FORMAT]

  And here was what I started experimenting with in Python.

  from pymediainfo import MediaInfo
  
  
  
  media_info = MediaInfo.parse('demo_SequenceV3.mp4')
  
  for track in media_info.tracks:
  
      if track.bit_rate is not None:
  
          print ("%s: %s" % (track.track_type, track.bit_rate))
  
      else:
  
          print ("""%s tracks do not have bit rate associated with them.""" % track.track_type)

  I know I’m not using MediaInfo correctly, but I couldn’t find any documentation on timecode, and to be honest I’m pretty confident it’ll just use FFMPEG’s system of searching for a data track that doesn’t appear to exist.

  Anyone here know enough about this to either get it working or to point me in the right direction ?

  The goal is to re-wrap an MP4 as an MOV and translate the timecode so it is back where it normally is on the MOV.

  EDIT : here is an example MP4 that I need to extract the timecode from :

  https://www.dropbox.com/s/a1euiumiapkpzhn/timecode_demo.mp4?dl=0

  And as you can see in this image, the MP4 does have timecode that is being read by Premiere on the bottom left of frame. TC starts at 10:11:12:13.

  https://www.dropbox.com/s/pafqicnnsqu93rl/timecode_window_in_premiere.png

• FFmpeg giving me failed to open segment error. Trying to parse .wav file into 30-second files

  7 novembre 2019, par Requiem_7

  Here is the command I used and the output when I try and parse the .wav file into 30-second clips :

  C:\Users\hmkur>ffmpeg -i C:\Users\hmkur\Desktop\Python\Transcribing_Audio\source\valve.wav -f segment -segment_time 30 -c copy parts/out%09d.wav
  
  ffmpeg version git-2019-11-05-c54268c Copyright (c) 2000-2019 the FFmpeg developers
  
    built with gcc 9.2.1 (GCC) 20191010
  
    configuration: --enable-gpl --enable-version3 --enable-sdl2 --enable-fontconfig --enable-gnutls --enable-iconv --enable-libass --enable-libdav1d --enable-libbluray --enable-libfreetype --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg --enable-libopus --enable-libshine --enable-libsnappy --enable-libsoxr --enable-libtheora --enable-libtwolame --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxml2 --enable-libzimg --enable-lzma --enable-zlib --enable-gmp --enable-libvidstab --enable-libvorbis --enable-libvo-amrwbenc --enable-libmysofa --enable-libspeex --enable-libxvid --enable-libaom --enable-libmfx --enable-ffnvcodec --enable-cuvid --enable-d3d11va --enable-nvenc --enable-nvdec --enable-dxva2 --enable-avisynth --enable-libopenmpt --enable-amf
  
    libavutil      56. 35.101 / 56. 35.101
  
    libavcodec     58. 60.100 / 58. 60.100
  
    libavformat    58. 34.101 / 58. 34.101
  
    libavdevice    58.  9.100 / 58.  9.100
  
    libavfilter     7. 66.100 /  7. 66.100
  
    libswscale      5.  6.100 /  5.  6.100
  
    libswresample   3.  6.100 /  3.  6.100
  
    libpostproc    55.  6.100 / 55.  6.100
  
  [wav @ 0000023133098a00] Discarding ID3 tags because more suitable tags were found.
  
  Guessed Channel Layout for Input Stream #0.0 : stereo
  
  Input #0, wav, from 'C:\Users\hmkur\Desktop\Python\Transcribing_Audio\source\valve.wav':
  
    Metadata:
  
      title           : valve
  
      encoder         : Lavf58.20.100 (libsndfile-1.0.24)
  
    Duration: 00:06:47.20, bitrate: 1411 kb/s
  
      Stream #0:0: Audio: pcm_s16le ([1][0][0][0] / 0x0001), 44100 Hz, stereo, s16, 1411 kb/s
  
  [segment @ 00000231334d18c0] Opening 'parts/out000000000.wav' for writing
  
  [segment @ 00000231334d18c0] Failed to open segment 'parts/out000000000.wav'
  
  Could not write header for output file #0 (incorrect codec parameters ?): No such file or directory
  
  Stream mapping:
  
    Stream #0:0 -> #0:0 (copy)
  
      Last message repeated 1 times

• ffmpeg complex filtering : how to get around

  19 janvier 2020, par Melvin Roest

  Alright, I have my own compiled ffmpeg with --enable-lv2. This allows for 3rd-party plugins to work. The plugin I use is : https://github.com/lucianodato/speech-denoiser it’s a plugin that wraps around this RNN noise reduction library : https://github.com/GregorR/rnnoise-models

  The following commands work :

  (1) ffmpeg -i input.mov -filter_complex '[0:a]lv2=plugin=https\\://github.com/lucianodato/speech-denoiser[audio]' -map "[audio]" output.wav

  (2) ffmpeg -i input.mov -filter_complex '[0:v]copy[video]' -map "[video]" output.mov

  But when I do the combination, that doesn’t work.

  ffmpeg -i input.mov -filter_complex '[0:a]lv2=plugin=https\\://github.com/lucianodato/speech-denoiser[audio];[0:v]copy[video]' -map "[audio]" -map "[video]" output.mov

  I think the error is essentially this :

  Channel layout change is not supported
  
  Error while filtering: Not yet implemented in FFmpeg, patches welcome
  
  Failed to inject frame into filter network: Not yet implemented in FFmpeg, patches welcome
  
  Error while processing the decoded data for stream #0:0

  My guess : this 3rd-party filter is not configure to work with any other output stream other than audio.

  My question : can I somehow trick this 3rd-party plugin that it is outputting to an audio file, while still outputting everything to a video file ?

  Note : I know, I can simply split this up in 2 commands and be done with it, so I’m wondering if I can accomplish this via one ffmpeg command. How I would split it up in 2 commands is as follows :

  ffmpeg -i out_cropped.mov -af 'lv2=plugin=https\\://github.com/lucianodato/speech-denoiser' -vcodec copy out_cropped_denoised.wav 
  
  
  
  &&
  
  
  
  ffmpeg -i out_cropped.mov -i out_cropped_denoised.wav -c:v copy -map 0:v:0 -map 1:a:0 out_cropped_denoised.mov

  But I want to be able to put it all in one complex filter (ideally) or at least in one ffmpeg command.

  Appendix : here is the full interaction

  ffmpeg -i input.mov -filter_complex '[0:a]lv2=plugin=https\\://github.com/lucianodato/speech-denoiser[audio];[0:v]copy[video]' -map "[audio]" -map "[video]" output.mov
  
  ffmpeg version N-95577-g68f623d644 Copyright (c) 2000-2019 the FFmpeg developers
  
    built with Apple clang version 11.0.0 (clang-1100.0.33.8)
  
    configuration: --prefix=/usr/local --enable-gpl --enable-nonfree --enable-libass --enable-libfdk-aac --enable-libfreetype --enable-libmp3lame --enable-libtheora --enable-libvorbis --enable-libvpx --enable-libx264 --enable-libx265 --enable-libopus --enable-libxvid --enable-lv2 --samples=fate-suite/
  
    libavutil      56. 35.101 / 56. 35.101
  
    libavcodec     58. 60.100 / 58. 60.100
  
    libavformat    58. 33.100 / 58. 33.100
  
    libavdevice    58.  9.100 / 58.  9.100
  
    libavfilter     7. 65.100 /  7. 65.100
  
    libswscale      5.  6.100 /  5.  6.100
  
    libswresample   3.  6.100 /  3.  6.100
  
    libpostproc    55.  6.100 / 55.  6.100
  
  Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'input.mov':
  
    Metadata:
  
      major_brand     : qt
  
      minor_version   : 512
  
      compatible_brands: qt
  
      encoder         : Lavf58.29.100
  
    Duration: 00:16:19.11, start: 0.000000, bitrate: 1341 kb/s
  
      Stream #0:0: Video: h264 (High) (avc1 / 0x31637661), yuv420p, 1080x960, 1262 kb/s, 29.97 fps, 29.97 tbr, 30k tbn, 59.94 tbc (default)
  
      Metadata:
  
        handler_name    : Core Media Video
  
        encoder         : Lavc58.54.100 libx264
  
      Stream #0:1: Audio: aac (LC) (mp4a / 0x6134706D), 44100 Hz, mono, fltp, 69 kb/s (default)
  
      Metadata:
  
        handler_name    : Core Media Audio
  
  File 'output.mov' already exists. Overwrite? [y/N] y

  #ote : I typed yes and then this came.

  Stream mapping:
  
    Stream #0:0 (h264) -> copy
  
    Stream #0:1 (aac) -> lv2
  
    lv2 -> Stream #0:0 (aac)
  
    copy -> Stream #0:1 (libx264)
  
  Press [q] to stop, [?] for help
  
  [out_0_0 @ 0x7fa6811066c0] Channel layout change is not supported
  
  Error while filtering: Not yet implemented in FFmpeg, patches welcome
  
  Failed to inject frame into filter network: Not yet implemented in FFmpeg, patches welcome
  
  Error while processing the decoded data for stream #0:0