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• HLS encoded video audio (ffmpeg) drops when seeking past buffer on Safari

  13 juin 2019, par eschie

  Some of my HLS encoded videos via ffmpeg drop the audio when seeking past the buffer. The only way to sync the audio and video up again is to restart the video. What would be causing this ?

  Example Profile :

  bitrate: 4800, profile: 'high', level: '4.1', resolution: 1080, framerate: '24000/1001'

  ffmpeg
  
      '-y' 
  
      '-i' input_file.mov                                                 
  
      '-v' error 
  
      '-map' '0:0'                                                        
  
      '-c:v' libx264                                                  
  
      '-x264opts' f'
  
          keyint=23:                  
  
          min-keyint=23:          
  
          no-scenecut                                                     
  
      '
  
      '-vf' f'scale=-1:1080'
  
      '-preset' 'slow'
  
      '-profile:v' 'high'
  
      '-level' '4.1'
  
      '-b:v' '4800k'
  
      '-maxrate' '4800k'
  
      '-movflags' 'faststart'
  
      '-bufsize' '9600k' 
  
      '-write_tmcd', '0'
  
      '-r' '24000/1001'                                   
  
      output_dir                                                      

  Segmentation CMD :

  FFMPEG 
  
      '-i' output_dir 
  
      '-v' 'error' 
  
      '-acodec' 'copy'
  
      '-vcodec' 'copy'
  
      '-hls_time' '4' #seconds
  
      '-hls_list_size' '0'
  
      '-hls_flags' 'single_file' 
  
      os.path.join(output_dir, f'{run_id}_{bitrate}.m3u8'

  Added : apple’s mediastreamvalidator outputs a few different errors :

  Error: Playlist vs segment duration mismatch
  
  --> Detail:  Segment duration 98.0146, Playlist duration: 4.7968
  
  --> Source:  1559962503399_2200k.m3u8 - 1559962503399_2200k.ts:1746520@0

  Error: Measured peak bitrate compared to master playlist declared value exceeds error tolerance
  
  --> Detail:  Measured: 3182.61 kb/s, Master playlist: 2173.82 kb/s, Error: 46.41%, Combined rendition name: English
  
  --> Source:  ...playlist.m3u8
  
  --> Compare: 1559962503399_2200k.m3u8

  Error: Different target durations detected
  
  --> Detail:  Target duration: 5 vs Target duration: 4
  
  --> Source:  1559962503399_64k.m3u8
  
  --> Compare: 1559962503399_128k.m3u8

• ffmpeg transcode to hls and multiple aac audio tracks

  23 août 2023, par Aquarius

  I'm trying to transcode h264 mp4 file to HLS format with multiple AAC audio tracks. On Windows browsers everythins works like a shine. There's an option to switch audio track

  


  

  


  It doesn't work on Android devices or TV. On Android Opera browser video works with sound, but screen stuck while seeking and there's no option to switch audio track. On TV browser video works, it doesn't stuck when seeking but also no option to switch audio track

  


  Using video.js player on site. Below code for transcode and produced manifest file

  


  ffmpeg -i "file.mp4" -i PL-6ch.aac -i EN-6ch.aac -map 0:v -map 1:a -map 2:a -c:v copy -c:a:0 aac -ac:a:0 6 -af channelmap=channel_layout=5.1 -c:a:1 aac -ac:a:1 6 -af channelmap=channel_layout=5.1 -tag:v:0 h264 -b:v:0 2500k -tag:a:0 aac -b:a:0 384k -tag:a:1 aac -b:a:1 384k -f hls -hls_time 10 -hls_playlist_type vod -hls_list_size 0 -master_pl_name file.m3u8 -var_stream_map "v:0,agroup:AAC a:0,agroup:AAC,language:pl a:1,agroup:AAC,language:en" file_%v_.m3u8


  


  #EXTM3U
#EXT-X-VERSION:3
#EXT-X-INDEPENDENT-SEGMENTS
#EXT-X-MEDIA:TYPE=AUDIO,GROUP-ID="AAC",NAME="Polish",AUTOSELECT=YES,DEFAULT=YES,LANGUAGE="pl",URI="file_1_.m3u8"
#EXT-X-MEDIA:TYPE=AUDIO,GROUP-ID="AAC",NAME="English",AUTOSELECT=YES,DEFAULT=NO,LANGUAGE="en",URI="file_2_.m3u8"
#EXT-X-STREAM-INF:PROGRAM-ID=1,BANDWIDTH=3172400,RESOLUTION=1920x872,CODECS="avc1.640029,mp4a.40.2",AUDIO="AAC" 
file_0_.m3u8

#EXT-X-STREAM-INF:BANDWIDTH=422400,CODECS="mp4a.40.2",AUDIO="AAC"
file_1_.m3u8

#EXT-X-STREAM-INF:BANDWIDTH=422400,CODECS="mp4a.40.2",AUDIO="AAC"
file_2_.m3u8


  


  Any clues what's wrong ?

  


• Build FFmpeg with Freetype2 for ARM ( Android )

  14 mai 2014, par Pawel Cala

  I’m trying to build FFmpeg binary file with freetype library included ( I need it for drawtext filter ). Unfortunately I cannot configure ffmpeg properly and every try ends with "freetype not found" error.

  PS I’ve tried to build guardian-ffmpeg project but i’m getting errors during configure process.

  PS2 Building plain ffmpeg works perfectly well

  Configuration script :

  make distclean &./configure --target-os=linux \
  
  --cross-prefix=arm-linux-androideabi- \
  
  --arch=arm \
  
  --cpu=armv7-a \
  
  --enable-libfreetype --enable-filter=drawtext \ #!Freetype params
  
  --disable-network \
  
  --disable-ffplay \
  
  --disable-ffprobe \
  
  --disable-ffserver \
  
  --enable-protocol=file \
  
  --sysroot=${ANDROID_NDK_ROOT_PATH}/platforms/${ANDROID_API_VERSION}/arch-arm \
  
  --prefix=build/armeabi-v7a \
  
  --disable-asm \
  
  --extra-cflags='-DANDROID -Ifreetype2/ -I${ANDROID_NDK_ROOT_PATH}/sources/cxx-stl/system/include -march=armv7-a -mfloat-abi=softfp' \
  
  --extra-ldflags='-Wl,--fix-cortex-a8 -Lfreetype2/ -L../android-libs -Wl,-rpath-link,../android-libs' \
  
  --extra-cxxflags='-Wno-multichar -fno-exceptions -fno-rtti'
  
  make -j6 && make install || exit 0

  Directories sctructure :

  ffmpeg/
  
     -ffmpeg dirs/
  
     -freetype2/
  
     -rest of ffmpeg files ( including configure, make, etc )

  I’ve checked patch sources in guardian-project and I’ve found that ffmpeg configure file might need some changes in require_libfreetype method ?!

  Thanks in advance ( and sorry for my bad english )

  EDIT :
  Building on OSX Mavericks,
  Last 3 lines of config.log ; OSX hasn’t got pkg-config therefore false in 2nd line :

  require_libfreetype
  
  false --exists --print-errors freetype
  
  ERROR: freetype not found