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• Compression rate (final size) ffmpeg with h263 as codec, can be improved ?

  29 août 2013, par voskyc

  With the following data :

  Sample 1 :
  vcodec : H263
  Duration : 4seconds
  Resolution:1288/720
  FR : 30fps/s
  datarate : 195.135 kB/s
  MP3 : 44HZ, 16bits

  ---

  Size file : 5.84MB.

  Sample 2 :
  vcodec : H263
  Duration : 4seconds
  Resolution:640/480
  FR : 30fps/s
  datarate : 195.135 kB/s
  MP3 : 44HZ, 16bits

  ---

  Size file = 3.34MB.

  Both in flv container.

  Aren't those sizes a little bit high for 4 second video ?

  I believe we are doing some kind of error or missing an optimization.
  Should we decrease the datarate ?
  Maybe we are missing some option for h263 encoding with FFMPEG ?.

  Thanks a lot in advance for your suggestions.

  Note : no, we "can not" use h264. :-)

• Final results of ffmpeg installation are libraries with missing links

  17 avril 2017, par Mikasa

  [poster@localhost lib]$ ldd libavfilter.so
  
      linux-vdso.so.1 =>  (0x00007ffc6bbd0000)
  
      libswscale.so.4 => not found
  
      libpostproc.so.54 => not found
  
      libavformat.so.57 => not found
  
      libavcodec.so.57 => not found
  
      libswresample.so.2 => not found
  
      libavutil.so.55 => not found
  
      libm.so.6 => /lib64/libm.so.6 (0x00007fc796d79000)
  
      libpthread.so.0 => /lib64/libpthread.so.0 (0x00007fc796b5c000)
  
      libc.so.6 => /lib64/libc.so.6 (0x00007fc79679b000)
  
      /lib64/ld-linux-x86-64.so.2 (0x00007fc79742b000)
  
  [poster@localhost lib]$ ldd libswscale.so
  
      linux-vdso.so.1 =>  (0x00007ffe29572000)
  
      libavutil.so.55 => not found
  
      libm.so.6 => /lib64/libm.so.6 (0x00007f4cfdea3000)
  
      libpthread.so.0 => /lib64/libpthread.so.0 (0x00007f4cfdc87000)
  
      libc.so.6 => /lib64/libc.so.6 (0x00007f4cfd8c6000)
  
      /lib64/ld-linux-x86-64.so.2 (0x00007f4cfe442000)

  All of them are like that.
  I’m a newb and don’t know how to solve this. They’re right next to each other.
  Any suggestion is appreciated. Thank you.

• MP4Box does not create final segment

  5 janvier 2019, par Dhruva

  MP4Box is not creating the final segment of video when I dash it. If I run this command on the command line I get only 15 segments out of 16(there is no error) and running it in Google’s Shaka player gives me a 404 at the end of the video saying that the 16th video segment is not found. I am running MP4Box version 0.5.2.

  MP4Box -dash 4000 -rap -frag-rap -sample-groups-traf -profile dashavc264:live -bs-switching multi -url-template video-700k-encrypted.mp4 video-1000k-encrypted.mp4 video-1500k-encrypted.mp4 video-2000k-encrypted.mp4 audio-encrypted.mp4 -out "dash_protected/manifest.mp4"

  .mpd file

  <?xml version="1.0"?>
  
  
  
  <mpd xmlns="urn:mpeg:dash:schema:mpd:2011" minbuffertime="PT1.500S" type="static" mediapresentationduration="PT0H1M0.096S" maxsegmentduration="PT0H0M4.000S" profiles="urn:mpeg:dash:profile:isoff-live:2011,http://dashif.org/guidelines/dash264">
  
   <programinformation moreinformationurl="http://gpac.sourceforge.net">
  
    
  
   </programinformation>
  
  
  
   <period duration="PT0H1M0.096S">
  
    <adaptationset segmentalignment="true" bitstreamswitching="true" maxwidth="1024" maxheight="576" maxframerate="24" par="16:9" lang="eng">
  
     <segmenttemplate initialization="manifest_set1_init.mp4"></segmenttemplate>
  
     <contentprotection schemeiduri="urn:mpeg:dash:mp4protection:2011" value="cenc"></contentprotection>
  
     <representation mimetype="video/mp4" codecs="avc3.64002a" width="852" height="480" framerate="24" sar="1:1" startwithsap="1" bandwidth="1477735">
  
      <segmenttemplate timescale="12288" media="source-video-1500k-encrypted_dash_track1_$Number$.m4s" startnumber="1" duration="49152"></segmenttemplate>
  
     </representation>
  
     <representation mimetype="video/mp4" codecs="avc3.64002a" width="512" height="288" framerate="24" sar="1:1" startwithsap="1" bandwidth="689308">
  
      <segmenttemplate timescale="12288" media="source-video-700k-encrypted_dash_track1_$Number$.m4s" startnumber="1" duration="49152"></segmenttemplate>
  
     </representation>
  
     <representation mimetype="video/mp4" codecs="avc3.64002a" width="1024" height="576" framerate="24" sar="1:1" startwithsap="1" bandwidth="1968345">
  
      <segmenttemplate timescale="12288" media="source-video-2000k-encrypted_dash_track1_$Number$.m4s" startnumber="1" duration="49152"></segmenttemplate>
  
     </representation>
  
     <representation mimetype="video/mp4" codecs="avc3.64002a" width="640" height="360" framerate="24" sar="1:1" startwithsap="1" bandwidth="994771">
  
      <segmenttemplate timescale="12288" media="source-video-1000k-encrypted_dash_track1_$Number$.m4s" startnumber="1" duration="49152"></segmenttemplate>
  
     </representation>
  
    </adaptationset>
  
    <adaptationset segmentalignment="true" lang="eng">
  
     <contentprotection schemeiduri="urn:mpeg:dash:mp4protection:2011" value="cenc"></contentprotection>
  
     <representation mimetype="audio/mp4" codecs="mp4a.40.2" audiosamplingrate="22050" startwithsap="1" bandwidth="69486">
  
      <audiochannelconfiguration schemeiduri="urn:mpeg:dash:23003:3:audio_channel_configuration:2011" value="2"></audiochannelconfiguration>
  
      <segmenttemplate timescale="22050" media="source-audio-encrypted_dash$Number$.m4s" startnumber="1" duration="88045" initialization="source-audio-encrypted_dashinit.mp4"></segmenttemplate>
  
     </representation>
  
    </adaptationset>
  
   </period>
  
  </mpd>