Merging Two .webm Files in Node.js using ffmpeg/mkvmerge

[ashok....@stuxbot.co.uk]

I tried to merge two .webm files in Node.js using ffmpeg and mkvmerge.

the webm files are made by whammy.js which uses an array of webp images in a given fps rate.

the ffmpeg doesnot give an error but the final output is only one of the file.

$ ffmpeg -i concat:"one.webm|two.webm" -codec copy output.webm

ffmpeg version 1.2 Copyright (c) 2000-2013 the FFmpeg developers

  built on Mar 31 2013 21:55:33 with Apple clang version 4.1 (tags/Apple/clang-421.11.66) (based on LLVM 3.1svn)

  configuration: --prefix=/opt/local --enable-swscale --enable-avfilter --enable-libmp3lame --enable-libvorbis --enable-libopus --enable-libtheora --enable-libschroedinger --enable-libopenjpeg --enable-libmodplug --enable-libvpx --enable-libspeex --enable-libfreetype --mandir=/opt/local/share/man --enable-shared --enable-pthreads --cc=/usr/bin/clang --arch=x86_64 --enable-yasm --enable-gpl --enable-postproc --enable-libx264 --enable-libxvid

  libavutil      52. 18.100 / 52. 18.100

  libavcodec     54. 92.100 / 54. 92.100

  libavformat    54. 63.104 / 54. 63.104

  libavdevice    54.  3.103 / 54.  3.103

  libavfilter     3. 42.103 /  3. 42.103

  libswscale      2.  2.100 /  2.  2.100

  libswresample   0. 17.102 /  0. 17.102

  libpostproc    52.  2.100 / 52.  2.100

[matroska,webm @ 0x7ffb63829c00] Unknown entry 0x63C5

Input #0, matroska,webm, from 'concat:one.webm|two.webm':

  Duration: 00:01:02.00, start: 0.000000, bitrate: 306 kb/s

    Stream #0:0: Video: vp8, yuv420p, 426x245, SAR 1:1 DAR 426:245, 2 tbr, 1k tbn, 1k tbc (default)

Output #0, webm, to 'output.webm':

  Metadata:

    encoder         : Lavf54.63.104

    Stream #0:0: Video: vp8, yuv420p, 426x245 [SAR 1:1 DAR 426:245], q=2-31, 1k tbn, 1k tbc (default)

Stream mapping:

  Stream #0:0 -> #0:0 (copy)

Press [q] to stop, [?] for help

[matroska,webm @ 0x7ffb63829c00] Unknown entry 0x1A45DFA3

[matroska,webm @ 0x7ffb63829c00] Unknown entry 0x18538067

frame=  124 fps=0.0 q=-1.0 Lsize=    1163kB time=00:01:01.50 bitrate= 154.9kbits/s    

video:1158kB audio:0kB subtitle:0 global headers:0kB muxing overhead 0.445548%

where as when i use mkv merge, it produces an error

$ mkvmerge -o output.webm one.webm +two.webm 

mkvmerge v5.8.0 ('No Sleep / Pillow') built on Aug 26 2013 13:58:43

Automatically enabling WebM compliance mode due to output file name extension.

Error: matroska_reader: A track is missing its track UID.

 

any suggestions would be helpful.

[Vignesh Venkatasubramanian]

This should work: 

ffmpeg -f concat -i <(echo -e "file '$(pwd)/one.webm'\nfile '$(pwd)/two.webm'") -c copy -y output.webm

The -f concat was recently added, so make sure you have the latest version of ffmpeg (from their git repo).

 

where as when i use mkv merge, it produces an error

$ mkvmerge -o output.webm one.webm +two.webm 

mkvmerge v5.8.0 ('No Sleep / Pillow') built on Aug 26 2013 13:58:43

Automatically enabling WebM compliance mode due to output file name extension.

Error: matroska_reader: A track is missing its track UID.

This looks like an issue with whammy's Muxer. Looks like it isn't putting a track UID on one of the tracks.

 

 

any suggestions would be helpful.

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[Ashok Poudel]

Thanks, it worked like magic !!! :)

[Swift Shawen]

Share an easier way to merge two WebM files, using Joyoshare video joiner. I tried it myself. It helps me merge multiple WebM files into one in losslessly quality within 3 steps.