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• ffmpeg : match audio video duration post concatenation

  20 janvier 2020, par Massimo Vantaggio

  I wrote this bash to automate concatentation of videos for dash mpeg streaming infinite loop.
  Im unable to obtain same duration for audio and video, with the videos that i’m using for testing i get always 6 ms more for audio track.
  May ask help to debug it and understand how to get same duration for both audio and video track ?

  #!/bin/bash
  
  #CANCAT 0.3
  
  
  
  cd input
  
  fps=()
  
  # GET FPS OF EACH VIDEO INTO ARRAY
  
  for f in *.mp4; do
  
      _f=$(ffmpeg -i "$f" 2>&1 | sed -n "s/.*, \\(.*\\) fp.*/\\1/p")
  
      fps+=("$_f")
  
  done
  
  
  
  #GET NUMBER OF ELEMENTS IN FPS ARRAY  
  
  tLen=${#fps[@]}
  
  #CHECK FPS EQUALITY     
  
  for tLen in "${fps[@]:1}"; do
  
      if [[ $tLen != ${fps[0]} ]]; then
  
          printf "WARNING: VIDEO’S FRAME-RATE ARE NOT EQUALS, THE PROCESS CAN’T START."
  
          printf "%s\\0" "${fps[@]}" |
  
              sort -zu |
  
              xargs -0 printf " %s"
  
          printf "\\n"
  
         exit 1
  
      fi
  
  done
  
  
  
  #AUDIO ENCODING
  
  for f in *.mp4; 
  
  do
  
  NAME=$(echo "$f" | cut -d'.' -f1) 
  
  ffmpeg -y -i "$f" -c copy -video_track_timescale 90k -c:a aac -b:a 384k -ar 44100 -ac 2 -shortest -af aresample=async=1 ../buffer/${NAME}_buffer.mp4
  
  done
  
  #-af aresample=async=1000
  
  #-filter_complex " [1:0] apad "
  
  
  
  cd ..
  
  cd buffer
  
  times=()
  
  for f in *.mp4; 
  
  do 
  
  echo "file '$f'" >> list.txt;
  
  
  
  # GET DURATION OF EACH VIDEO
  
  _t=$(ffprobe -i "$f" -show_entries format=duration -v quiet -of csv="p=0")
  
  times+=("$_t")
  
  done
  
  
  
  #SUM ALL DURATIONS
  
  TOTALDURATION=$( echo "${times[@]}" | sed 's/ /+/g' | bc )
  
  DURROUND=$(echo "$TOTALDURATION" | cut -d'.' -f1)
  
  TOTDELTA="$((DURROUND%2))"
  
  TOTDUR="$(($DURROUND-$TOTDELTA))"
  
  
  
  #GET FPS
  
  FPS="$(ffmpeg -i ${f[0]} 2>&1 | sed -n "s/.*, \(.*\) fp.*/\1/p")"
  
  #ROUND FPS
  
  FPSC=$( echo "($FPS+0.5)/1" | bc )
  
  #GET GOP
  
  GOP="$((FPSC*2))"
  
  
  
  #ENCODING MASTER TRACK
  
  ffmpeg -f concat -safe 0 -y -i list.txt -loop 1 -i ../logo/logo.png -c:a copy -c:v libx264 -x264opts keyint=$GOP:min-keyint=$GOP:no-scenecut -bf 0 -r $FPSC -b:v 4800k -maxrate 9600k -bufsize 19200k -profile:v main -crf 22 -filter_complex "[0:v][1:v]overlay=main_w-overlay_w-10:10,scale=1920:1080,setsar=1" -t $TOTDUR 1080set.mp4 
  
  
  
  #EXTRACTING AUDIO FROM MASTER VIDEO TRACK
  
  ffmpeg -y -i 1080set.mp4 -c copy -vn ../output/output_audio.mp4
  
  
  
  #REMOVE AUDIO FROM MASTER VIDEO TRACK
  
  ffmpeg -y -i 1080set.mp4 -c copy -an ../output/output_1080.mp4
  
  
  
  #CLEAN BUFFER
  
  rm *.mp4
  
  rm *.txt
  
  
  
  cd .. 
  
  cd output
  
  
  
  #ENCODE 720p
  
  ffmpeg -y -i output_1080.mp4 -an -c:v libx264 -x264opts keyint=$GOP:min-keyint=$GOP:no-scenecut -bf 0 -s 1280x720 -r $FPSC -b:v 2400k -maxrate 4800k -bufsize 9600k -profile:v main -crf 22 output_720.mp4
  
  
  
  #ENCODE 360p
  
  ffmpeg -y -i output_1080.mp4 -an -c:v libx264 -x264opts keyint=$GOP:min-keyint=$GOP:no-scenecut -bf 0 -s 640x360 -r $FPSC -b:v 800k -maxrate 1600k -bufsize 3200k -profile:v main -crf 22 output_360.mp4
  
  
  
  #VALIDATOR
  
  echo 1080p ENCODING
  
  echo GOP:   $GOP 
  
  echo VIDEO FORMAT CONTAINER DURATION:   
  
  ffprobe -v error -show_entries format=duration \
  
    -of default=noprint_wrappers=1:nokey=1 output_1080.mp4
  
  echo VIDEO STREAM DURATION:
  
  ffprobe -v error -select_streams v:0 -show_entries stream=duration \
  
    -of default=noprint_wrappers=1:nokey=1 output_1080.mp4
  
  echo AUDIO FORMAT CONTAINER DURATION:   
  
  ffprobe -v error -show_entries format=duration \
  
    -of default=noprint_wrappers=1:nokey=1 output_audio.mp4
  
  
  
  echo ______________________________________________________________
  
  
  
  echo 720p ENCODING
  
  echo GOP:   $GOP 
  
  echo VIDEO FORMAT CONTAINER DURATION:   
  
  ffprobe -v error -show_entries format=duration \
  
    -of default=noprint_wrappers=1:nokey=1 output_720.mp4
  
  echo VIDEO STREAM DURATION:
  
  ffprobe -v error -select_streams v:0 -show_entries stream=duration \
  
    -of default=noprint_wrappers=1:nokey=1 output_720.mp4
  
  echo DONE
  
  exit 1

  Here the script with my videos for test and relative folders :
  https://gofile.io/?c=WPAC0Q

• AVPlayer currentTime not match with the displayed frame after many seeking. (HLS Stream)

  26 août 2022, par D.Bence

  I have a m3u8 file which i want to use with HLS.
link to m3u8 file

  


  My problem is that when i seek many times, the currentTime not match with the displayed frame. I experience that, the more seeking there is more difference. (it's like a constant +offset)

  


  Our use case is very timing sensitive, we need to stop the videos at specific positions. For this we use the following code :

  


  [_player addBoundaryTimeObserverForTimes:times
      queue:dispatch_get_main_queue()
      usingBlock:^{
            weakSelf.player.rate = 0.0;
            // The time is correct here, but the displayed frame is not sync with this time
            CMTimeShow(weakSelf.player.currentTime);
      }
]   


  


  I read that AVURLAssetPreferPreciseDurationAndTimingKey can help, but the currentTime still wrong.

  


  NSDictionary<nsstring> *options = @{AVURLAssetPreferPreciseDurationAndTimingKey:@YES};&#xA;AVURLAsset *urlAsset = [AVURLAsset URLAssetWithURL:url options:options];&#xA;AVPlayerItem *item = [AVPlayerItem playerItemWithAsset:urlAsset];&#xA;</nsstring>

  


  I also read that there is a problem with the m3u8 itself. (for example wrong GOP size.)

  


  What is the reason for the incorrect currentTime, and how can i fix this ?

  


  ffprobe m3u8 :

  


  ffprobe https://mrkresz-content-bucket.s3.eu-central-1.amazonaws.com/applicationData/extended-path-videos/4b0046fd-0be7-4a07-bc7c-c1a0069116b1/released/50816bc9-6118-4dd1-a90e-fb72652bb06f-final-from-anonymized.m3u8
ffprobe version 5.1 Copyright (c) 2007-2022 the FFmpeg developers
  built with Apple clang version 13.1.6 (clang-1316.0.21.2.5)
  configuration: --prefix=/opt/homebrew/Cellar/ffmpeg/5.1 --enable-shared --enable-pthreads --enable-version3 --cc=clang --host-cflags= --host-ldflags= --enable-ffplay --enable-gnutls --enable-gpl --enable-libaom --enable-libbluray --enable-libdav1d --enable-libmp3lame --enable-libopus --enable-librav1e --enable-librist --enable-librubberband --enable-libsnappy --enable-libsrt --enable-libtesseract --enable-libtheora --enable-libvidstab --enable-libvmaf --enable-libvorbis --enable-libvpx --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxml2 --enable-libxvid --enable-lzma --enable-libfontconfig --enable-libfreetype --enable-frei0r --enable-libass --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg --enable-libspeex --enable-libsoxr --enable-libzmq --enable-libzimg --disable-libjack --disable-indev=jack --enable-videotoolbox --enable-neon
  libavutil      57. 28.100 / 57. 28.100
  libavcodec     59. 37.100 / 59. 37.100
  libavformat    59. 27.100 / 59. 27.100
  libavdevice    59.  7.100 / 59.  7.100
  libavfilter     8. 44.100 /  8. 44.100
  libswscale      6.  7.100 /  6.  7.100
  libswresample   4.  7.100 /  4.  7.100
  libpostproc    56.  6.100 / 56.  6.100
[hls @ 0x152f04280] Skip ('#EXT-X-VERSION:3')
[hls @ 0x152f04280] Skip ('#EXT-X-INDEPENDENT-SEGMENTS')
[hls @ 0x152f04280] Opening 'https://mrkresz-content-bucket.s3.eu-central-1.amazonaws.com/applicationData/extended-path-videos/4b0046fd-0be7-4a07-bc7c-c1a0069116b1/released/50816bc9-6118-4dd1-a90e-fb72652bb06f-final-from-anonymized1080p_6000000bitrate.m3u8' for reading
[hls @ 0x152f04280] Skip ('#EXT-X-VERSION:3')
[https @ 0x154045000] Opening 'https://mrkresz-content-bucket.s3.eu-central-1.amazonaws.com/applicationData/extended-path-videos/4b0046fd-0be7-4a07-bc7c-c1a0069116b1/released/50816bc9-6118-4dd1-a90e-fb72652bb06f-final-from-anonymized1080p_15000000bitrate.m3u8' for reading
[hls @ 0x152f04280] Skip ('#EXT-X-VERSION:3')
[https @ 0x154045000] Opening 'https://mrkresz-content-bucket.s3.eu-central-1.amazonaws.com/applicationData/extended-path-videos/4b0046fd-0be7-4a07-bc7c-c1a0069116b1/released/50816bc9-6118-4dd1-a90e-fb72652bb06f-final-from-anonymized1520p_33000000bitrate.m3u8' for reading
[hls @ 0x152f04280] Skip ('#EXT-X-VERSION:3')
[hls @ 0x152f04280] Opening 'https://mrkresz-content-bucket.s3.eu-central-1.amazonaws.com/applicationData/extended-path-videos/4b0046fd-0be7-4a07-bc7c-c1a0069116b1/released/50816bc9-6118-4dd1-a90e-fb72652bb06f-final-from-anonymized1080p_6000000bitrate_00001.ts' for reading
[hls @ 0x152f04280] Opening 'https://mrkresz-content-bucket.s3.eu-central-1.amazonaws.com/applicationData/extended-path-videos/4b0046fd-0be7-4a07-bc7c-c1a0069116b1/released/50816bc9-6118-4dd1-a90e-fb72652bb06f-final-from-anonymized1080p_6000000bitrate_00002.ts' for reading
[hls @ 0x152f04280] Opening 'https://mrkresz-content-bucket.s3.eu-central-1.amazonaws.com/applicationData/extended-path-videos/4b0046fd-0be7-4a07-bc7c-c1a0069116b1/released/50816bc9-6118-4dd1-a90e-fb72652bb06f-final-from-anonymized1080p_15000000bitrate_00001.ts' for reading
[hls @ 0x152f04280] Opening 'https://mrkresz-content-bucket.s3.eu-central-1.amazonaws.com/applicationData/extended-path-videos/4b0046fd-0be7-4a07-bc7c-c1a0069116b1/released/50816bc9-6118-4dd1-a90e-fb72652bb06f-final-from-anonymized1080p_15000000bitrate_00002.ts' for reading
[hls @ 0x152f04280] Opening 'https://mrkresz-content-bucket.s3.eu-central-1.amazonaws.com/applicationData/extended-path-videos/4b0046fd-0be7-4a07-bc7c-c1a0069116b1/released/50816bc9-6118-4dd1-a90e-fb72652bb06f-final-from-anonymized1520p_33000000bitrate_00001.ts' for reading
[hls @ 0x152f04280] Opening 'https://mrkresz-content-bucket.s3.eu-central-1.amazonaws.com/applicationData/extended-path-videos/4b0046fd-0be7-4a07-bc7c-c1a0069116b1/released/50816bc9-6118-4dd1-a90e-fb72652bb06f-final-from-anonymized1520p_33000000bitrate_00002.ts' for reading
Input #0, hls, from 'https://mrkresz-content-bucket.s3.eu-central-1.amazonaws.com/applicationData/extended-path-videos/4b0046fd-0be7-4a07-bc7c-c1a0069116b1/released/50816bc9-6118-4dd1-a90e-fb72652bb06f-final-from-anonymized.m3u8':
  Duration: 00:49:43.00, start: 2.033367, bitrate: 0 kb/s
  Program 0
    Metadata:
      variant_bitrate : 8133826
  Stream #0:0: Video: h264 (Main) ([27][0][0][0] / 0x001B), yuv420p, 1920x1080 [SAR 1:1 DAR 16:9], 29.97 fps, 29.97 tbr, 90k tbn
    Metadata:
      variant_bitrate : 8133826
  Program 1
    Metadata:
      variant_bitrate : 18870392
  Stream #0:1: Video: h264 (Main) ([27][0][0][0] / 0x001B), yuv420p, 1920x1080 [SAR 1:1 DAR 16:9], 29.97 fps, 29.97 tbr, 90k tbn
    Metadata:
      variant_bitrate : 18870392
  Program 2
    Metadata:
      variant_bitrate : 40776144
  Stream #0:2: Video: h264 (Main) ([27][0][0][0] / 0x001B), yuv420p, 2704x1520 [SAR 1:1 DAR 169:95], 29.97 fps, 29.97 tbr, 90k tbn
    Metadata:
      variant_bitrate : 40776144


  


  ffprobe original mp4 :

  


  ffprobe https://mrkresz-content-bucket.s3.eu-central-1.amazonaws.com/applicationData/extended-path-videos/4b0046fd-0be7-4a07-bc7c-c1a0069116b1/finalized/50816bc9-6118-4dd1-a90e-fb72652bb06f-final-from-anonymized.mp4
ffprobe version 5.1 Copyright (c) 2007-2022 the FFmpeg developers
  built with Apple clang version 13.1.6 (clang-1316.0.21.2.5)
  configuration: --prefix=/opt/homebrew/Cellar/ffmpeg/5.1 --enable-shared --enable-pthreads --enable-version3 --cc=clang --host-cflags= --host-ldflags= --enable-ffplay --enable-gnutls --enable-gpl --enable-libaom --enable-libbluray --enable-libdav1d --enable-libmp3lame --enable-libopus --enable-librav1e --enable-librist --enable-librubberband --enable-libsnappy --enable-libsrt --enable-libtesseract --enable-libtheora --enable-libvidstab --enable-libvmaf --enable-libvorbis --enable-libvpx --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxml2 --enable-libxvid --enable-lzma --enable-libfontconfig --enable-libfreetype --enable-frei0r --enable-libass --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg --enable-libspeex --enable-libsoxr --enable-libzmq --enable-libzimg --disable-libjack --disable-indev=jack --enable-videotoolbox --enable-neon
  libavutil      57. 28.100 / 57. 28.100
  libavcodec     59. 37.100 / 59. 37.100
  libavformat    59. 27.100 / 59. 27.100
  libavdevice    59.  7.100 / 59.  7.100
  libavfilter     8. 44.100 /  8. 44.100
  libswscale      6.  7.100 /  6.  7.100
  libswresample   4.  7.100 /  4.  7.100
  libpostproc    56.  6.100 / 56.  6.100
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'https://mrkresz-content-bucket.s3.eu-central-1.amazonaws.com/applicationData/extended-path-videos/4b0046fd-0be7-4a07-bc7c-c1a0069116b1/finalized/50816bc9-6118-4dd1-a90e-fb72652bb06f-final-from-anonymized.mp4':
  Metadata:
    major_brand     : isom
    minor_version   : 512
    compatible_brands: isomiso2avc1mp41
    encoder         : Lavf58.76.100
  Duration: 00:49:42.81, start: 0.000000, bitrate: 36142 kb/s
  Stream #0:0[0x1](und): Video: h264 (High) (avc1 / 0x31637661), yuv420p(progressive), 2486x1398, 36138 kb/s, 29.97 fps, 29.97 tbr, 30k tbn (default)
    Metadata:
      handler_name    : VideoHandler
      vendor_id       : [0][0][0][0]


  


• What are all the command `options` to execute with ?

  25 janvier 2023, par Phil Lucks

  I'd like to be able to compress the video in a way to help improve upload times.

  


  In reading the docs for FFMpeg Kit, using React Native, there is a basic execute command string of '-i file1.mp4 -c:v mpeg4 file2.mp4'... I can guess at what some of this means, in terms of input & output file names based on the ffMPEG docs, however, some of these options I am not sure of.

  


  Like why is there a -i flag prefix ? Is this "input" ?
Why is there -c:v ? Is this "convert video" ?
What if I want to reduce frame rate, or change size of video ?

  


  The TS def is just a string...

  


  Is there a good place to understand what the official docs options map to the strings ? I think