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• Converting mp4 to ogg file format results in a large file

  26 avril 2014, par parags

  I have a MP4 file of 83MB (converted from MOV of about 772MB using FFMPEG). For the file to be playable from all browsers from HTML5 video tag, I am converting the MP4 to OGG, again using FFMPEG command

  ffmpeg -i object-creation.mp4 -acodec libvorbis -vcodec libtheora -q:v 5 -q:a 5 object-creation-3.ogg
  

  The result of the above command is a very large OGG file of around 500 MB. I would certainly not want to upload such huge files to Amazon S3 (which I am using for storage, and distribution).

  Is there something I am missing here? Is the file not compressed enough?

  Is it possible to have the resultant file of somewhat manageable size like 80-100 MB without any appreciable loss in quality over what is seen in MP4 format? Why is it that even the source file is 83MB, the resultant file is too big in comparison?

  Thanks Parag

• ffmpeg Video thumbnail Service

  26 avril 2014, par user3576217

  I need active FFMPEG Video thumbnail Service. I have installed just FFMPEG but see Video thumbnail Service not working. I checked ffmpeg version on SSH and got this

  ffmpeg version 2.2.1 Copyright (c) 2000-2014 the FFmpeg developers
    built on Apr 13 2014 13:00:18 with gcc 4.4.6 (GCC) 20120305 (Red Hat 4.4.6-4)
    configuration: --prefix=/usr --libdir=/usr/lib64 --shlibdir=/usr/lib64 --mandir=/usr/share/man --enable-shared --enable-runtime-cpudetect --enable-gpl --enable-version3 --enable-postproc --enable-avfilter --enable-pthreads --enable-x11grab --enable-vdpau --disable-avisynth --enable-frei0r --enable-libopencv --enable-libdc1394 --enable-libgsm --enable-libmp3lame --enable-libnut --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg --enable-librtmp --enable-libspeex --enable-libtheora --enable-libvorbis --enable-libvpx --enable-libx264 --enable-libxavs --enable-libxvid --extra-cflags='-O2 -g -pipe -Wall -Wp,-D_FORTIFY_SOURCE=2 -fexceptions -fstack-protector --param=ssp-buffer-size=4 -m64 -mtune=generic -fPIC' --disable-stripping

  is their any way to enable just video thumbnail service?

• Desktop Audio in FFmpeg [on hold]

  26 avril 2014, par user3576075

  I try to record my screen with ffmpeg, I'm on Archlinux so I applied the (Arch)Wiki:

  ffmpeg -f x11grab -video_size 1920x1080 -i $DISPLAY -f alsa -i default -c:v ffvhuff -c:a flac test.mkv
  

  They are using the default sound device in ALSA, but not working for me. No sound ! I tried to set the device to another, but I don't know how to list them.

  Any ideas what could be wrong or ideas on how to identify the issue ? Thanks.

• AVFrame / AVPicture change color component

  26 avril 2014, par RoeeL

  Given a video stream (runs with SDL), I need to somehow make the video's frames color green only, blue only and red only (depends on input).

  How can I do that ? How can I set the color component to be RED only for instance? (R = 255, G = 0, B = 0)

  Didn't manage to find anything on google. would love to get some assistance.

  thanks

• Android browser play m3u8 after recv #EXT-X-ENDLIST

  26 avril 2014, par user3567118

  I'm developing HLS, it works fine on safari, but when I play it use my android device(4.1.1), it just download(no play). If I append #EXT-X-ENDLIST to the end of m3u8 file, it can play after all the files are downloaded. This problem has troubled me for many days，please help me.

  thanks!

  The html code: