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  • Video recoding with ffmpeg

    8 novembre 2011, par Aleks G

    I asked in another question (http://stackoverflow.com/questions/8012494/sorry-this-video-cannot-be-played-streaming-mp4-to-android/8012874#8012874) about video playback in android using VideoView. Apparently, the problem there is due to the way my video is encoded, as another video (512Kb mp4 off the web) plays correctly using my code. As videos are uploaded by my end users to the web site, I don't have any control of the videos themselves, however I do have control over re-coding these. I re-code them using ffmpeg to bring them to a standard MP4 (H.264+AAC) format and scale them to the same size (320x240).

    Here's the ffmpeg info of a video that would not play :

    sh-3.2$ ffmpeg -i video.bad.mp4
    
FFmpeg version SVN-r25679-snapshot, Copyright (c) 2000-2010 the FFmpeg developers
    
  built on Nov  5 2010 09:34:37 with gcc 4.3.2
    
  configuration: --prefix=/usr --enable-shared --enable-libmp3lame --enable-gpl --enable-libvorbis --enable-pthreads --enable-libfaac --enable-libxvid --enable-postproc --enable-libgsm --enable-x11grab --enable-libx264 --enable-libtheora --extra-cflags=-Wall --enable-swscale --enable-libdc1394 --enable-nonfree --disable-mmx --disable-stripping --enable-avfilter --disable-altivec --disable-armv5te --disable-armv6 --disable-vis --enable-nonfree --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-version3
    
  libavutil     50.32. 6 / 50.32. 6
    
  libavcore      0.12. 0 /  0.12. 0
    
  libavcodec    52.94. 3 / 52.94. 3
    
  libavformat   52.84. 0 / 52.84. 0
    
  libavdevice   52. 2. 2 / 52. 2. 2
    
  libavfilter    1.56. 0 /  1.56. 0
    
  libswscale     0.12. 0 /  0.12. 0
    
  libpostproc   51. 2. 0 / 51. 2. 0
    
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from &#39;video.bad.mp4&#39;:
    
  Metadata:
    
    major_brand     : isom
    
    minor_version   : 512
    
    compatible_brands: isomiso2avc1mp41
    
    encoder         : Lavf52.84.0
    
  Duration: 00:00:45.93, start: 0.000000, bitrate: 591 kb/s
    
    Stream #0.0(und): Video: h264, yuv420p, 320x240 [PAR 1:1 DAR 4:3], 535 kb/s, 15 fps, 15 tbr, 15 tbn, 30 tbc
    
    Stream #0.1(und): Audio: aac, 48000 Hz, stereo, s16, 51 kb/s

    And here's the ffmpeg info of a video that plays correctly :

    sh-3.2$ ffmpeg -i video.mp4
    
FFmpeg version SVN-r25679-snapshot, Copyright (c) 2000-2010 the FFmpeg developers
    
  built on Nov  5 2010 09:34:37 with gcc 4.3.2
    
  configuration: --prefix=/usr --enable-shared --enable-libmp3lame --enable-gpl --enable-libvorbis --enable-pthreads --enable-libfaac --enable-libxvid --enable-postproc --enable-libgsm --enable-x11grab --enable-libx264 --enable-libtheora --extra-cflags=-Wall --enable-swscale --enable-libdc1394 --enable-nonfree --disable-mmx --disable-stripping --enable-avfilter --disable-altivec --disable-armv5te --disable-armv6 --disable-vis --enable-nonfree --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-version3
    
  libavutil     50.32. 6 / 50.32. 6
    
  libavcore      0.12. 0 /  0.12. 0
    
  libavcodec    52.94. 3 / 52.94. 3
    
  libavformat   52.84. 0 / 52.84. 0
    
  libavdevice   52. 2. 2 / 52. 2. 2
    
  libavfilter    1.56. 0 /  1.56. 0
    
  libswscale     0.12. 0 /  0.12. 0
    
  libpostproc   51. 2. 0 / 51. 2. 0
    
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from &#39;video.mp4&#39;:
    
  Metadata:
    
    major_brand     : isom
    
    minor_version   : 512
    
    compatible_brands: mp41
    
    title           : crazytown - http://www.archive.org/details/Cartoon-Crazytown
    
    encoder         : Lavf51.10.0
    
  Duration: 00:07:50.40, start: 0.000000, bitrate: 578 kb/s
    
    Stream #0.0(und): Video: h264, yuv420p, 320x240, 510 kb/s, 25 fps, 25 tbr, 25 tbn, 50 tbc
    
    Stream #0.1(und): Audio: aac, 48000 Hz, stereo, s16, 63 kb/s

    I have two questions here, actually. First, which of the details in my "bad" video does android not like ? And, second, what parameters should I use with ffmpeg to recode my videos ? As present I use this :

    ffmpeg -i $input_video_file -y -s 320x240 -vcodec libx264 -vpre medium -acodec libfaac -b 510K -ar 48000 -aspect 4:3 $tmpfile.mp4
    
qt-faststart $tmpfile.mp4 $output_video_file.mp4

    But this produces a video that's not playable on android. Any help is greatly appreciated.

  • converting of wma to mp3 through ffmpeg is not working

    8 novembre 2011, par Rahul Mehta

    I want to convert my wma file to mp3 by ffmpeg .
    why this error is coming what should i do ? i installed libmp3lame already .

    when i am trying to convert by following command gives error :

    /var/www/yapi$ sudo /usr/local/bin/ffmpeg -i uploads/4e02dc4f197c1.wma uploads/4e02dc4f1b212.mp3
    
ffmpeg version N-30971-g4b87a08, Copyright (c) 2000-2011 the FFmpeg developers
    
  built on Jun 23 2011 10:08:49 with gcc 4.4.5
    
  configuration: --enable-gpl --enable-version3 --enable-nonfree --enable-postproc --enable-x11grab
    
  libavutil    51.  9. 1 / 51.  9. 1
    
  libavcodec   53.  7. 0 / 53.  7. 0
    
  libavformat  53.  4. 0 / 53.  4. 0
    
  libavdevice  53.  1. 1 / 53.  1. 1
    
  libavfilter   2. 23. 0 /  2. 23. 0
    
  libswscale    2.  0. 0 /  2.  0. 0
    
  libpostproc  51.  2. 0 / 51.  2. 0
    
Input #0, asf, from &#39;uploads/4e02dc4f197c1.wma&#39;:
    
  Metadata:
    
    title           : "Highway Blues"
    
    artist          : Marc Seales, composer. New Stories. Ernie Watts, saxophone.
    
    genre           : Jazz
    
    album           : Speakin&#39; Out
    
    track           : 1
    
    WM/Year         : 1999
    
    WMFSDKVersion   : 8.00.00.4389
    
    WMFSDKNeeded    : 0.0.0.0000
    
  Duration: 00:01:33.71, start: 0.000000, bitrate: 64 kb/s
    
    Stream #0.0: Audio: wmav2, 44100 Hz, 2 channels, s16, 64 kb/s
    
File &#39;uploads/4e02dc4f1b212.mp3&#39; already exists. Overwrite ? [y/N] y
    

    
Output #0, mp3, to &#39;uploads/4e02dc4f1b212.mp3&#39;:
    
    Stream #0.0: Audio: [0][0][0][0] / 0x0000, 44100 Hz, 2 channels, s16, 64 kb/s
    
Stream mapping:
    
  Stream #0.0 -> #0.0
    
Encoder (codec id 86017) not found for output stream #0.0

    why it is not working ?

  • ffmpeg : AVI to FLV conversion doubles file size

    22 septembre 2012, par weekens

    I convert AVI to FLV with ffmpeg using -sameq parameter (same quality) :

    ffmpeg -i test.avi -sameq -f flv sameq.flv

    The resulting file has the same video and audio quality as the original, but it's more than twice the original file size :

    84M sameq.flv
    
41M test.avi

    Why does it happen ?

    Transcoder output :

    ffmpeg version N-34750-g070d2d7, Copyright (c) 2000-2011 the FFmpeg developers
    
  built on Nov 12 2011 11:23:07 with gcc 4.6.1
    
  configuration: --enable-gpl --enable-version3 --enable-nonfree --enable-postproc --enable-libfaac --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libtheora --enable-libvorbis --enable-libx264 --enable-libxvid --enable-x11grab
    
  libavutil    51. 24. 1 / 51. 24. 1
    
  libavcodec   53. 33. 0 / 53. 33. 0
    
  libavformat  53. 20. 0 / 53. 20. 0
    
  libavdevice  53.  4. 0 / 53.  4. 0
    
  libavfilter   2. 48. 0 /  2. 48. 0
    
  libswscale    2.  1. 0 /  2.  1. 0
    
  libpostproc  51.  2. 0 / 51.  2. 0
    
Input #0, avi, from &#39;test.avi&#39;:
    
  Duration: 00:06:30.00, start: 0.000000, bitrate: 866 kb/s
    
    Stream #0:0: Video: mpeg4 (Advanced Real Time Simple Profile) (DIVX / 0x58564944), yuv420p, 400x300 [SAR 1:1 DAR 4:3], 25 tbr, 25 tbn, 25 tbc
    
    Stream #0:1: Audio: mp3 (U[0][0][0] / 0x0055), 44100 Hz, mono, s16, 64 kb/s
    
[buffer @ 0xa247ae0] w:400 h:300 pixfmt:yuv420p tb:1/1000000 sar:1/1 sws_param:
    
Output #0, flv, to &#39;sameq.flv&#39;:
    
  Metadata:
    
    encoder         : Lavf53.20.0
    
    Stream #0:0: Video: flv1 ([2][0][0][0] / 0x0002), yuv420p, 400x300 [SAR 1:1 DAR 4:3], q=2-31, 200 kb/s, 1k tbn, 25 tbc
    
    Stream #0:1: Audio: mp3 ([2][0][0][0] / 0x0002), 44100 Hz, mono, s16, 128 kb/s
    
Stream mapping:
    
  Stream #0:0 -> #0:0 (mpeg4 -> flv)
    
  Stream #0:1 -> #0:1 (mp3 -> libmp3lame)
    
Press [q] to stop, [?] for help
    
frame= 9742 fps=255 q=0.0 Lsize=   85074kB time=00:06:30.00 bitrate=1787.0kbits/s    
    
video:79163kB audio:5525kB global headers:0kB muxing overhead 0.455568%

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