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• Converting video files from mp4 to webM for playing using Media Source Extensions

  19 octobre 2018, par raul

  I’m currently trying to implement a video player using Media Source Extensions. Currently just a very simple proof of concept, following a tutorial I found here.

  I cloned their repo with all source code from github here and am testing the implementation on Chromium and Firefox with various video files.

  Everything worked well with the example webm files in the repo for both browsers.

  Next I tried to convert a video I downloaded from some random site using ffmpeg and mse-tools to "align the clusters" of the webm file using the following commands :

  ffmpeg -i randomvideo.mp4 -c:v libvpx -c:a libvorbis output.webm
  
  mse_webm_remuxer output.webm aligned.webm

  Again, all was well on both browsers.

  Finally, I wanted to convert a very simple animation I created in blender (rendered with h264 in mp4).

  I tried converting the resulting file using the same process as above and the file played normally on firefox, but did not load on chromium.

  I assume I am commiting some error when converting the file, but inspecting the attributes of the final file with vlc and ffprobe, I could not find any obvious problems.

  Any ideas as to what I am doing wrong ?

  One final test I did was to go to this site to get some sample webm files.

  I downloaded the "Big Buck Bunny Trailer in WebM" and "Elephants Dream as WebM File".

  Both files worked in firefox, but the "Elephants Dream" file would not play in chromium.

  I am on a linux machine (Arch Linux distro) with the following versions of the browsers :

  Chromium Version 69.0.3497.100 (Official Build) Arch Linux (64-bit)

  Firefox 62.0.3 (64-bit)

  I have shared the file I created from the blender animation (very small - only 36 KB) on google drive here in case anyone wants to check it out.

• FFmpeg : How to put encoded media data from one container to another with out re-encoding ?

  17 août 2012, par Blender

  So for example : I have file.mp3, I know that my desired format can play sound with out video (for example FLV) so how to put encoded mp3 data using ffmpeg from mp3 container into flv (where to get articles/code samples on this) ?

  I mean not from cmd but from C++ using ffmpeg as library. (see tags)

• tv unable to playback ffmpeg converted media

  27 juin 2017, par Sambir

  I am trying to convert some raw video camerafiles using the following ffmpeg commmand. after conversion the pc plays back the files without any problem. also the phone plays it back using vlc. but the tv gives unsupported format. the tv plays back all files even h265 but only this file it gives an error. any help is appreciated :

  ffmpeg command :

  ffmpeg -i 1.mov -map_metadata -1 -c:v libx264 -c:a aac -ac 2 -b:a 128k -strict -2 -crf 23 -preset veryfast -threads 0 converted/1.mp4

  and this is the ffmpeg info of the original file :

  built with gcc 4.8 (Ubuntu 4.8.2-19ubuntu1)
  
    configuration: --prefix=/root/ffmpeg/target --extra-cflags='-I/root/ffmpeg/target/inclu     de -static' --extra-ldflags='-L/root/ffmpeg/target/lib -lm -static' --extra-version=Xtrea     m-Codes --enable-nonfree --enable-openssl --disable-debug --disable-shared --enable-libx2     65 --enable-static --extra-cflags=--static --disable-ffplay --disable-ffserver --disable-     doc --enable-gpl --enable-pthreads --enable-postproc --enable-libass --enable-gray --enab     le-runtime-cpudetect --enable-gnutls --enable-libmp3lame --enable-libopus --enable-libthe     ora --enable-libvorbis --enable-libx264 --enable-libxvid --enable-bzlib --enable-zlib --e     nable-version3 --enable-libvpx --enable-libxavs --disable-devices --enable-librtmp --extr     a-libs='-lrtmp -lnettle -lhogweed -lgmp -lssl -lcrypto -lz -lc -ldl'
  
    libavutil      54. 20.100 / 54. 20.100
  
    libavcodec     56. 28.100 / 56. 28.100
  
    libavformat    56. 25.101 / 56. 25.101
  
    libavdevice    56.  4.100 / 56.  4.100
  
    libavfilter     5. 12.100 /  5. 12.100
  
    libswscale      3.  1.101 /  3.  1.101
  
    libswresample   1.  1.100 /  1.  1.100
  
    libpostproc    53.  3.100 / 53.  3.100
  
  Input #0, mov,mp4,m4a,3gp,3g2,mj2, from '2.mov':
  
    Metadata:
  
      major_brand     : qt
  
      minor_version   : 0
  
      compatible_brands: qt
  
      creation_time   : 2017-05-18 07:39:04
  
    Duration: 00:10:38.28, start: 0.000000, bitrate: 239010 kb/s
  
      Stream #0:0(und): Video: prores (apcn / 0x6E637061), yuv422p10le(bt709), 1920x1080, 2     36756 kb/s, SAR 1:1 DAR 16:9, 50 fps, 50 tbr, 5k tbn, 5k tbc (default)
  
      Metadata:
  
        creation_time   : 2017-05-18 07:39:04
  
        handler_name    : Core Media Data Handler
  
        encoder         : Apple ProRes 422
  
        timecode        : 00:00:00:00
  
      Stream #0:1(und): Audio: pcm_s24le (lpcm / 0x6D63706C), 44100 Hz, stereo, s32 (24 bit     ), 2116 kb/s (default)
  
      Metadata:
  
        creation_time   : 2017-05-18 07:39:04
  
        handler_name    : Core Media Data Handler
  
      Stream #0:2(und): Data: none (tmcd / 0x64636D74), 0 kb/s (default)
  
      Metadata:
  
        creation_time   : 2017-05-18 07:39:04
  
        handler_name    : Core Media Data Handler
  
        timecode        : 00:00:00:00
  
  At least one output file must be specified

  After conversion i get like 1.mp4,2.mp4,3.mp4... then I concat them using concat command to one file. all went ok without any problem but the tv does not support the file.

  I found out it is encoded with apple prores so I googled some conversion commands but they also did not seem to help like this :

  yuv422p, lossless audio
  
  ffmpeg -i "input.mov" -pix_fmt "yuv422p" -vcodec libx264 -preset medium -qp 0 -acodec pcm_s16le "output_yuv422p.mkv"
  
  
  
  yuv422p, aac audio
  
  ffmpeg -i "input.mov" -pix_fmt "yuv422p" -vcodec libx264 -preset medium -qp 0 -acodec -acodec libvo_aacenc -b:a 256K "output_yuv422p.mp4"