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• ffmpeg : Audio out of sync after conversion mp4 -> DNxHD

  7 février 2019, par Daniel E

  Based on this post I used the command :

  ffmpeg -i input.mp4 -c:v dnxhd -vf "scale=1280:720,fps=29.90,format=yuv422p" -b:v 110M -c:a pcm_s16le output.mov

  to convert an mp4 file to mov with the dnxhd video codec. I also want the pcm_s16le audio codec.

  Here you can see the input file’s properties :

  Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'mexico-raw-combined.mp4':                                                                                                                                             
  
    Metadata:
  
      major_brand     : isom
  
      minor_version   : 512 
  
      compatible_brands: isomiso2avc1mp41
  
      encoder         : Lavf58.23.101
  
    Duration: 00:49:59.01, start: 0.000000, bitrate: 17220 kb/s
  
      Stream #0:0(eng): Video: h264 (High) (avc1 / 0x31637661), yuv420p(tv, bt709), 1920x1080, 16961 kb/s, SAR 1:1 DAR 16:9, 29.90 fps, 29.92 tbr, 90k tbn, 180k tbc (default)
  
      Metadata:
  
        handler_name    : VideoHandle
  
      Stream #0:1(eng): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 249 kb/s (default)
  
      Metadata:
  
        handler_name    : SoundHandle

  And here are the output file’s properties :

   Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'output.mov':
  
    Metadata:
  
      major_brand     : qt  
  
      minor_version   : 512
  
      compatible_brands: qt  
  
      encoder         : Lavf58.12.100
  
    Duration: 00:49:59.01, start: 0.000000, bitrate: 111235 kb/s
  
      Stream #0:0(eng): Video: dnxhd (DNXHD) (AVdn / 0x6E645641), yuv422p(tv, bt709/unknown/unknown), 1280x720, 109733 kb/s, SAR 1:1 DAR 16:9, 29.90 fps, 29.90 tbr, 19136 tbn, 19136 tbc (default)
  
      Metadata:
  
        handler_name    : DataHandler
  
        encoder         : Lavc58.18.100 dnxhd
  
      Stream #0:1(eng): Audio: pcm_s16le (sowt / 0x74776F73), 48000 Hz, stereo, s16, 1536 kb/s (default)
  
      Metadata:
  
        handler_name    : DataHandler

  The issue is that towards the end of the output file (keep in mind it’s a 50 min video) the audio ends a bit ahead of the video, and the last 1 min 10 seconds are silent for some reason.

  Also note that I chose a framerate of 29.9 fps because that’s what the input file uses.

• Can I add silent audio based on another video, to a video created from a PNG loop

  25 mars 2019, par GDP

  We have videos that we transcode to h.264, but COPY the original audio track (they all vary). We are now trying to prepend a 10 second disclaimer before the original video begins. Apparently the audio tracks of the two videos must be the same, so I’m trying to add a silent audio track to the generated video based on the audio track of the video it will be concatenated with.

  From other questions, I’ve learned to add -f lavfi -i anullsrc=channel_layout=stereo:sample_rate=44100, but this results in garbled audio when the concatenation occurs. So using ffprobe, I would like to get whatever audio properties are needed and use them in the prepending video.

  So the question is : How can I specify the specific audio track settings I want/need when creating the 10 second video ?

  FFMpeg to create 10 second disclaimer

  ffmpeg.exe -f lavfi -i anullsrc=channel_layout=stereo:sample_rate=44100 -loop 1 -i disclaimer.png -filter:v "fade=out:st=8:d=2" -c:v libx264 -t 10 -pix_fmt yuv420p -r 29.97 disclaimer.mp4

  FFProbe

  ffprobe -show_format -show_streams OriginalVideo.mp4
  
  ffprobe version N-73975-gda8b70b Copyright (c) 2007-2015 the FFmpeg developers
  
    built 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-libdcadec --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-lzma --enable-decklink --enable-zlib
  
    libavutil      54. 28.100 / 54. 28.100
  
    libavcodec     56. 52.100 / 56. 52.100
  
    libavformat    56. 40.101 / 56. 40.101
  
    libavdevice    56.  4.100 / 56.  4.100
  
    libavfilter     5. 27.100 /  5. 27.100
  
    libswscale      3.  1.101 /  3.  1.101
  
    libswresample   1.  2.101 /  1.  2.101
  
    libpostproc    53.  3.100 / 53.  3.100
  
  Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'OriginalVideo.mp4':
  
    Metadata:
  
      major_brand     : isom
  
      minor_version   : 512
  
      compatible_brands: isomiso2avc1mp41
  
      title           : 343520959333629
  
      encoder         : Lavf56.40.101
  
    Duration: 00:00:24.56, start: 0.160998, bitrate: 245 kb/s
  
      Stream #0:0(und): Video: h264 (High) (avc1 / 0x31637661), yuv420p, 640x400 [SAR 1615:1616 DAR 323:202], 194 kb/s, 25 fps, 25 tbr, 90k tbn, 50 tbc (default)
  
      Metadata:
  
        handler_name    : VideoHandler
  
      Stream #0:1(und): Audio: aac (HE-AACv2) (mp4a / 0x6134706D), 44100 Hz, stereo, fltp, 47 kb/s (default)
  
      Metadata:
  
        handler_name    : SoundHandler
  
  [STREAM]
  
  index=0
  
  codec_name=h264
  
  codec_long_name=H.264 / AVC / MPEG-4 AVC / MPEG-4 part 10
  
  profile=High
  
  codec_type=video
  
  codec_time_base=1/50
  
  codec_tag_string=avc1
  
  codec_tag=0x31637661
  
  width=640
  
  height=400
  
  coded_width=640
  
  coded_height=400
  
  has_b_frames=2
  
  sample_aspect_ratio=1615:1616
  
  display_aspect_ratio=323:202
  
  pix_fmt=yuv420p
  
  level=31
  
  color_range=N/A
  
  color_space=unknown
  
  color_transfer=unknown
  
  color_primaries=unknown
  
  chroma_location=left
  
  timecode=N/A
  
  refs=5
  
  is_avc=1
  
  nal_length_size=4
  
  id=N/A
  
  r_frame_rate=25/1
  
  avg_frame_rate=25/1
  
  time_base=1/90000
  
  start_pts=0
  
  start_time=0.000000
  
  duration_ts=2181600
  
  duration=24.240000
  
  bit_rate=194642
  
  max_bit_rate=N/A
  
  bits_per_raw_sample=8
  
  nb_frames=606
  
  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
  
  TAG:language=und
  
  TAG:handler_name=VideoHandler
  
  [/STREAM]
  
  [STREAM]
  
  index=1
  
  codec_name=aac
  
  codec_long_name=AAC (Advanced Audio Coding)
  
  profile=HE-AACv2
  
  codec_type=audio
  
  codec_time_base=1/44100
  
  codec_tag_string=mp4a
  
  codec_tag=0x6134706d
  
  sample_fmt=fltp
  
  sample_rate=44100
  
  channels=2
  
  channel_layout=stereo
  
  bits_per_sample=0
  
  id=N/A
  
  r_frame_rate=0/0
  
  avg_frame_rate=0/0
  
  time_base=1/44100
  
  start_pts=-7100
  
  start_time=-0.160998
  
  duration_ts=1083268
  
  duration=24.563900
  
  bit_rate=47738
  
  max_bit_rate=48053
  
  bits_per_raw_sample=N/A
  
  nb_frames=526
  
  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
  
  TAG:language=und
  
  TAG:handler_name=SoundHandler
  
  [/STREAM]
  
  [FORMAT]
  
  filename=OriginalVideo.mp4
  
  nb_streams=2
  
  nb_programs=0
  
  format_name=mov,mp4,m4a,3gp,3g2,mj2
  
  format_long_name=QuickTime / MOV
  
  start_time=-0.160998
  
  duration=24.564000
  
  size=753253
  
  bit_rate=245319
  
  probe_score=100
  
  TAG:major_brand=isom
  
  TAG:minor_version=512
  
  TAG:compatible_brands=isomiso2avc1mp41
  
  TAG:title=343520959333629
  
  TAG:encoder=Lavf56.40.101
  
  [/FORMAT]

• Transcoding to H264. PTS and DTS sync accross multiple output streams with different bitrates

  25 mars 2019, par timmytimmers

  I have a setup where I am transcoding live feeds from OTA broadcasts to H264 using the Nvidia NVENC encoder. I am also transcoding the audio to AAC. We are trying to output 3 cbr streams and various bitrates. The problem I am running into is that the PTS and DTS on the multiple outputs are not aligning which is critical for our use case. I am hoping there is an easy fix to this but I have not yet been able to locate one. Any thoughts on how to accomplish this ?

  ===> Source Feed <===

  ffprobe udp://@238.224.1.5:59005
  
  ffprobe version N-93005-gd92f06e Copyright (c) 2007-2019 the FFmpeg developers
  
    built with gcc 7 (Ubuntu 7.3.0-27ubuntu1~18.04)
  
    configuration: --prefix=/home/circle/ffmpeg_build --pkg-config-flags=--static --extra-cflags=-I/home/circle/ffmpeg_build/include --extra-ldflags=-L/home/circle/ffmpeg_build/lib --extra-libs='-lpthread -lm' --bindir=/home/circle/bin --enable-gpl --enable-libaom --enable-libass --enable-libfdk-aac --enable-libfreetype --enable-libmp3lame --enable-libopus --enable-libvorbis --enable-libvpx --enable-libx264 --enable-libx265 --enable-nonfree --enable-nvenc
  
    libavutil      56. 26.100 / 56. 26.100
  
    libavcodec     58. 44.100 / 58. 44.100
  
    libavformat    58. 26.100 / 58. 26.100
  
    libavdevice    58.  6.101 / 58.  6.101
  
    libavfilter     7. 48.100 /  7. 48.100
  
    libswscale      5.  4.100 /  5.  4.100
  
    libswresample   3.  4.100 /  3.  4.100
  
    libpostproc    55.  4.100 / 55.  4.100
  
  [mpeg2video @ 0x558e5a80fa40] Invalid frame dimensions 0x0.
  
      Last message repeated 22 times
  
  Input #0, mpegts, from 'udp://@238.224.1.5:59005:
  
    Duration: N/A, start: 89037.540778, bitrate: N/A
  
    Program 3 
  
      Stream #0:0[0x31]: Video: mpeg2video (Main) ([2][0][0][0] / 0x0002), yuv420p(tv, progressive), 1280x720 [SAR 1:1 DAR 16:9], Closed Captions, 59.94 fps, 59.94 tbr, 90k tbn, 119.88 tbc
  
      Stream #0:1[0x34](eng): Audio: ac3 ([129][0][0][0] / 0x0081), 48000 Hz, 5.1(side), fltp, 384 kb/s
  
      Stream #0:2[0x35](spa): Audio: ac3 ([129][0][0][0] / 0x0081), 48000 Hz, stereo, fltp, 192 kb/s

  ===> Command I am currently running to transcode <===

  screen -d -m ffmpeg -i 'udp://@238.224.1.5:59005?fifo_size=1000000&overrun_nonfatal=1' \
  
          -vcodec h264_nvenc -bf:v 2 -g 120 -rc cbr -b:v 6000K -profile:v high -level 4.0 -acodec aac -ac 2 -b:a 128k -ar 44100 -f mpegts -metadata service_name="test6000" -metadata service_provider="test" 'udp://@239.1.1.1:59001?pkt_size=1316' \
  
          -vcodec h264_nvenc -bf:v 2 -g 120 -rc cbr -b:v 3500K -profile:v high -level 4.0 -acodec aac -ac 2 -b:a 128k -ar 44100 -f mpegts -metadata service_name="test3500" -metadata service_provider="test" 'udp://@239.1.1.2:59002?pkt_size=1316' \
  
          -vcodec h264_nvenc -bf:v 2 -g 120 -rc cbr -b:v 1500K -profile:v high -level 4.0 -acodec aac -ac 2 -b:a 128k -ar 44100 -f mpegts -metadata service_name="test1500" -metadata service_provider="test" 'udp://@239.1.1.3:59003?pkt_size=1316'

  These streams will be eventually mux’d back together for DRM insertion into a ABR stream. Without those values being in sync it will not be ABR compliant.