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• MPEG-DASH not working. MPD validation fails

  16 novembre 2017, par Marko36

  I am trying to serve video using MPEG-DASH. No success. I have tried the following :

  Following the instructions on webproject.org, using FFMPEG, I have created several variants of the original video and the DASH MPD manifest, containing metadata. However, the manifest does not validate using http://dashif.org/conformance.html. This validator itself is quite useless, as it provides unusable info about the error. I have found in a post from 2014, that one of the errors generated by FFMPEG is capital letters in some metadata (not a critical one, but could have been fixed for years !). Other errors detected, but not described. No tangible info from any of these other validators either : http://www-itec.uni-klu.ac.at/dash/?page_id=605 (produces rubbish info), https://github.com/Eyevinn/dash-validator-js (throws an exception)

  Following instructions on mozilla.org, produces the same non-working result, as the instructions are nearly identical (including same resolution*bitrate sets), except that Mozilla omits the use of dash.js, which is deemed necessary by the rest of the internet.

  This guide on Bitmovin, utilizing x264 and MP4Box does not work either. Going by the instructions, I have to recode the original x264 video twice. The final version of videos are in some cases twice the size of their intermediate versions and 720p video is actually larger than its 1080p, higher bitrate counterpart. No need to go further. (Yet, this is the only way that actually produced segments..)

  I have spent 3 days on the above, read about all there is on the web from the other frustrated adopters, and ran out of options. I would really apreciate some pro tips ! Thanks !

• How can select only two audio streams in a video and feed it to the ebur128 filter wiithin ffmpeg ?

  18 avril 2017, par Edwin

  I want to use FFmpeg to analyze the loudness of an MXF video file.
  I have an MXF file with 8 mono audio streams. I only want to feed the first two streams through the ebur128 filter. But I can’t find a way to do that. The FFmpeg documentation is not clear to me, as I am fairly new to FFmpeg.

  I tried several things :

  ffmpeg -i source.mxf -nostats -filter_complex ebur128=dualmono=true:panlaw=-3.01dB -f null -

  I am sure it’s just that I don’t have the filtering syntax right. But hey... I’m a newbie...

  ---

  ffmpeg -i myVideo.mxf -nostats -filter_complex [0:a:0][0:a:1]amerge; ebur128=dualmono=true:panlaw=-3.01 -f null -

  And this is the resulting console output :

  ffmpeg version 2.8.6 Copyright (c) 2000-2016 the FFmpeg developers
  
  built with llvm-gcc 4.2.1 (LLVM build 2336.11.00)
  
  configuration: --prefix=/Volumes/Ramdisk/sw --enable-gpl --enable-        pthreads --enable-version3 --enable-libspeex --enable-libvpx --disable-decoder=libvpx --enable-libmp3lame --enable-libtheora --enable-libvorbis --enable-libx264 --enable-avfilter --enable-libopencore_amrwb --enable-libopencore_amrnb --enable-filters --enable-libgsm --enable-libvidstab --enable-libx265 --disable-doc --arch=x86_64 --enable-runtime-cpudetect
  
  libavutil      54. 31.100 / 54. 31.100
  
  libavcodec     56. 60.100 / 56. 60.100
  
  libavformat    56. 40.101 / 56. 40.101
  
  libavdevice    56.  4.100 / 56.  4.100
  
  libavfilter     5. 40.101 /  5. 40.101
  
  libswscale      3.  1.101 /  3.  1.101
  
  libswresample   1.  2.101 /  1.  2.101
  
  libpostproc    53.  3.100 / 53.  3.100
  
  
  
  Guessed Channel Layout for  Input Stream #0.1 : mono
  
  Guessed Channel Layout for  Input Stream #0.2 : mono
  
  Guessed Channel Layout for  Input Stream #0.3 : mono
  
  Guessed Channel Layout for  Input Stream #0.4 : mono
  
  Guessed Channel Layout for  Input Stream #0.5 : mono
  
  Guessed Channel Layout for  Input Stream #0.6 : mono
  
  Guessed Channel Layout for  Input Stream #0.7 : mono
  
  Guessed Channel Layout for  Input Stream #0.8 : mono
  
  Input #0, mxf, from 'myVideo.mxf':
  
  Metadata:
  
  uid             : a727a381-1f5a-11e7-bdc8-18af61b92a5a
  
  generation_uid  : a727a382-1f5a-11e7-9a04-18af61b92a5a
  
  company_name    : Adobe Systems Incorporated
  
  product_name    : Adobe Media Encoder
  
  product_version : 11.0.2
  
  application_platform: Mac OS X
  
  product_uid     : 0c3919fe-46e8-11e5-a151-feff819cdc9f
  
  modification_date: 2017-04-12 08:33:07
  
  material_package_umid: 0x060A2B340101010501010D1113000000A0C9D501557805A5DF7018AF61B92A5A
  
  timecode        : 00:00:00:00
  
  Duration: 00:05:24.08, start: 0.000000, bitrate: 59986 kb/s
  
  Stream #0:0: Video: mpeg2video (4:2:2), yuv422p(tv, unknown/bt709/bt709), 1920x1080 [SAR 1:1 DAR 16:9], 50000 kb/s, 25 fps, 25 tbr, 25 tbn, 50 tbc
  
  Metadata:
  
    file_package_umid: 0x060A2B340101010501010D12133A5D15A0C9D501557805A5B09318AF61B92A5A
  
    file_package_name: Source Package
  
  Stream #0:1: Audio: pcm_s24le, 48000 Hz, 1 channels, s32 (24 bit), 1152 kb/s
  
  Metadata:
  
    file_package_umid: 0x060A2B340101010501010D12133A5D15A0C9D501557805A5B09318AF61B92A5A
  
    file_package_name: Source Package
  
  Stream #0:2: Audio: pcm_s24le, 48000 Hz, 1 channels, s32 (24 bit), 1152 kb/s
  
  Metadata:
  
    file_package_umid: 0x060A2B340101010501010D12133A5D15A0C9D501557805A5B09318AF61B92A5A
  
    file_package_name: Source Package
  
  Stream #0:3: Audio: pcm_s24le, 48000 Hz, 1 channels, s32 (24 bit), 1152 kb/s
  
  Metadata:
  
    file_package_umid: 0x060A2B340101010501010D12133A5D15A0C9D501557805A5B09318AF61B92A5A
  
    file_package_name: Source Package
  
  Stream #0:4: Audio: pcm_s24le, 48000 Hz, 1 channels, s32 (24 bit), 1152 kb/s
  
  Metadata:
  
    file_package_umid: 0x060A2B340101010501010D12133A5D15A0C9D501557805A5B09318AF61B92A5A
  
    file_package_name: Source Package
  
  Stream #0:5: Audio: pcm_s24le, 48000 Hz, 1 channels, s32 (24 bit), 1152 kb/s
  
  Metadata:
  
    file_package_umid: 0x060A2B340101010501010D12133A5D15A0C9D501557805A5B09318AF61B92A5A
  
    file_package_name: Source Package
  
  Stream #0:6: Audio: pcm_s24le, 48000 Hz, 1 channels, s32 (24 bit), 1152 kb/s
  
  Metadata:
  
    file_package_umid: 0x060A2B340101010501010D12133A5D15A0C9D501557805A5B09318AF61B92A5A
  
    file_package_name: Source Package
  
  Stream #0:7: Audio: pcm_s24le, 48000 Hz, 1 channels, s32 (24 bit), 1152 kb/s
  
  Metadata:
  
    file_package_umid: 0x060A2B340101010501010D12133A5D15A0C9D501557805A5B09318AF61B92A5A
  
    file_package_name: Source Package
  
  Stream #0:8: Audio: pcm_s24le, 48000 Hz, 1 channels, s32 (24 bit), 1152 kb/s
  
  Metadata:
  
    file_package_umid: 0x060A2B340101010501010D12133A5D15A0C9D501557805A5B09318AF61B92A5A
  
    file_package_name: Source Package
  
  Filter amerge has a unconnected output
  
  
  
  bash: -f: command not found

  I changed the name of the video to myVideo.mxf.

• FFServer Timeshift Tee Muxer Output

  9 septembre 2017, par Aaron

  When feeding into ffserver from ffmpeg using the tee muxer, clients connecting with the ?date=HH:MM:SS option aren’t being properly timeshifted, they just get the live stream. My best guess is that timestamps aren’t being applied correctly to the incoming feed.

  Here’s the ffmpeg command I’m using with the tee muxer :

  $ ffmpeg -v 32 -threads 1 -f mpegts -analyzeduration 2000000 \
  
           -i "http://192.168.1.175:5004/auto/v4.1?duration=600" \
  
           -flags +global_header -f tee -map 0:v -map 0:a \
  
           -c:a aac -c:v h264 -preset veryfast \
  
           -b:v 3000k -bufsize 24000k -minrate 2400k -maxrate 3000k \ 
  
           "[select=\'v:0,a:0:1\']/Users/aaron/Movies/test.mp4|[select=\'v:0,a:0\']http://localhost:1234/feed.ffm"

  Here’s the contents of my ffserver configuration :

  HTTPPort 1234
  
  HTTPBindAddress 0.0.0.0
  
  MaxClients 5
  
  CustomLog ffserver.log
  
  MaxBandwidth 50000
  
  
  
  <feed>
  
  File feed.ffm
  
  FileMaxSize 16384M
  
  ACL allow localhost
  
  </feed>
  
  
  
  <stream>
  
  Feed feed.ffm
  
  Format mpegts
  
  AudioCodec aac
  
  AudioBitRate 128
  
  AudioChannels 2
  
  AudioSampleRate 44100
  
  AVOptionAudio flags +global_header
  
  
  
  VideoCodec libx264
  
  AVOptionVideo preset veryfast
  
  VideoBitRate 3000
  
  VideoFrameRate 30
  
  VideoBufferSize 24000
  
  VideoSize hd1080
  
  AVOptionVideo flags +global_header
  
  </stream>

  The transcode, mp4 output, and stream all work, the only problem is the lack of timeshifting.

  Removing the tee muxer and just doing the feed to ffserver fixes the timeshifting. With this command :

  ffmpeg -v 32 -threads 1 -f mpegts -analyzeduration 2000000 \
  
         -i "http://192.168.1.175:5004/auto/v4.1?duration=600"  \
  
         -f ffm -map 0:v -map 0:a -c:a aac -c:v h264 -preset veryfast \
  
         -b:v 3000k -bufsize 24000k -minrate 2400k -maxrate 3000k \
  
         http://localhost:1234/feed.ffm