Recherche avancée

Sur d’autres sites (7436)

• Efficiently write a movie directly from np.array using pipes

  16 juin 2017, par Matt Billman

  I have a 4D numpy array of movie frames. I’m looking for a function to write them to a movie, at a given framerate. I have FFMPEG installed on my OS, and as I can see from these answers, the most efficient way to do so is via pipes.

  However, I have very little experience using pipes, and the explanations in the link above make little sense to me. Furthermore, very few of the answers seem actually implement pipes, and the one that does uses mencoder, not FFMPEG. I am relatively inexperienced with FFMPEG, so am not sure how to modify the command string from the mencoder answer to make it work in FFMPEG.

  WHAT I WOULD LIKE :

  A function of the following form :

  animate_np_array(4d_array, framerate) -> output.mp4 (or other video codec)

  Which implements pipes to send frames one after the other to FFMPEG, and which I can copy-paste into my existing code.

  Furthermore, it is absolutely necessary that this function never actually plots any of the frames, as calls to the matplotlib.imshow() function (as I have most typically seen used) slow things down considerably.

• MPEG-DASH MPD file not playing correctly

  24 juin 2017, par CMOS

  So I am working on generating a very simple MPD manifest file for my MPEG-DASH videos and I cannot figure out what is wrong. Here is my current manifest file

  <?xml version="1.0" ?>
  
  <mpd xmlns="urn:mpeg:dash:schema:mpd:2011" minbuffertime="PT1.500S" type="static" mediapresentationduration="PT0H9M21.795S" maxsegmentduration="PT0H0M1.001S" profiles="urn:mpeg:dash:profile:isoff-on-demand:2011">
  
      <period>
  
          <baseurl>https://mysite/uploads/sources/resolution_640/bitrate_1400/</baseurl>
  
          <adaptationset mimetype="video/mp4">
  
              <contentcomponent contenttype="video"></contentcomponent>
  
              <representation bandwidth="1400000">
  
                <segmentlist duration="119">
  
                  <initialization sourceurl="https://mysite/uploads/sources/resolution_640/bitrate_1400/640x360_1400Kpbs_0.mp4"></initialization>
  
                  <segmenturl media="https://mysite/uploads/sources/resolution_640/bitrate_1400/640x360_1400Kpbs_1.mp4"></segmenturl>
  
                  <segmenturl media="https://mysite/uploads/sources/resolution_640/bitrate_1400/640x360_1400Kpbs_2.mp4"></segmenturl>
  
                  <segmenturl media="https://mysite/uploads/sources/resolution_640/bitrate_1400/640x360_1400Kpbs_3.mp4"></segmenturl>
  
                </segmentlist>
  
              </representation>
  
          </adaptationset>
  
      </period>
  
  </mpd>

  This MPD file validates using every validator I can find. The urls for the segments are obscured for security reasons but they are all open, public and viewable individually. But when I try to run the manifest file, depending on the player I get. "No supported source found within manifest" or simply nothing happens.

  Any idea how this could be wrong ? I am currently using media url’s as absolute paths but I have also tried paths relative to the BaseURL with no luck. Any info on how I can make a very simple MPEG-Dash manifest structure would be great. I am using FFMPEG to split my video up into 150 frame segments. Thanks !

• Error while opening encoder for output stream #0:0

  26 août 2017, par Celestine Timmy

  I can’t play a video using clipbucket after installation, getting conversion status as completed but while playing the video I get an message as "not available"

  Conversion file

  Checking File ....
  
  File : /var/www/html/files/conversion_queue/14958856828d300.mp4
  
  File Exists : Yes
  
  
  
  Preparing file...
  
  format : mov,mp4,m4a,3gp,3g2,mj2
  
  
  
  duration : 62.09
  
  
  
  size : 4480694
  
  
  
  bitrate : 577316
  
  
  
  video_width : 640
  
  
  
  video_height : 360
  
  
  
  video_wh_ratio : 1.7777777777778
  
  
  
  video_codec : h264
  
  
  
  video_rate : 23.976023976024
  
  
  
  video_bitrate : 479302
  
  
  
  video_color : N/A
  
  
  
  audio_codec : aac
  
  
  
  audio_bitrate : 95999
  
  
  
  audio_rate : 44100
  
  
  
  audio_channels : 2
  
  
  
  path : /var/www/html/files/conversion_queue/14958856828d300.mp4
  
  
  
  rotation : 0
  
  
  
  ======Converting Video=========
  
  
  
  Starting : Thumbs Generation
  
  
  
  
  
  =======Low Resolution Conversion=======
  
  
  
  
  
  Sarting : Generating Low resolution video @ 2017-05-27 17:18:11
  
  
  
  Converting Video SD File
  
  
  
  Command : /usr/local/bin/ffmpeg -i /var/www/html/files/conversion_queue/14958856828d300.mp4 -vcodec flv -acodec libmp3lame -s 640x360 -preset medium -f mp4 -b:v 512000 -minrate 512000 -maxrate 512000 -b:a 128000 -minrate 128000 -maxrate 128000 -r 25 -ar 22050 /var/www/html/files/videos/2017/05/27/14958856828d300-sd.mp4
  
  
  
  ffmpeg output : ffmpeg version 2.6.8 Copyright (c) 2000-2016 the FFmpeg developers
  
  built with gcc 4.4.7 (GCC) 20120313 (Red Hat 4.4.7-16)
  
  configuration: --prefix=/usr --bindir=/usr/bin --datadir=/usr/share/ffmpeg --incdir=/usr/include/ffmpeg --libdir=/usr/lib64 --mandir=/usr/share/man --arch=x86_64 --optflags='-O2 -g -pipe -Wall -Wp,-D_FORTIFY_SOURCE=2 -fexceptions -fstack-protector --param=ssp-buffer-size=4 -m64 -mtune=generic' --enable-bzlib --disable-crystalhd --enable-gnutls --enable-ladspa --enable-libass --enable-libdc1394 --enable-libfaac --enable-nonfree --disable-indev=jack --enable-libfreetype --enable-libgsm --enable-libmp3lame --enable-openal --enable-libopenjpeg --enable-libopus --enable-libpulse --enable-libschroedinger --enable-libsoxr --enable-libspeex --enable-libtheora --enable-libvorbis --enable-libv4l2 --enable-libx264 --enable-libx265 --enable-libxvid --enable-x11grab --enable-avfilter --enable-avresample --enable-postproc --enable-pthreads --disable-static --enable-shared --enable-gpl --disable-debug --disable-stripping --shlibdir=/usr/lib64 --enable-runtime-cpudetect
  
  libavutil 54. 20.100 / 54. 20.100
  
  libavcodec 56. 26.100 / 56. 26.100
  
  libavformat 56. 25.101 / 56. 25.101
  
  libavdevice 56. 4.100 / 56. 4.100
  
  libavfilter 5. 11.102 / 5. 11.102
  
  libavresample 2. 1. 0 / 2. 1. 0
  
  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 '/var/www/html/files/conversion_queue/14958856828d300.mp4':
  
  Metadata:
  
  major_brand : mp42
  
  minor_version : 0
  
  compatible_brands: isommp42
  
  creation_time : 2016-03-17 10:27:42
  
  Duration: 00:01:02.09, start: 0.000000, bitrate: 577 kb/s
  
  Stream #0:0(und): Video: h264 (Constrained Baseline) (avc1 / 0x31637661), yuv420p(tv, bt709), 640x360 [SAR 1:1 DAR 16:9], 479 kb/s, 23.98 fps, 23.98 tbr, 24k tbn, 47.95 tbc (default)
  
  Metadata:
  
  handler_name : VideoHandler
  
  Stream #0:1(eng): Audio: aac (LC) (mp4a / 0x6134706D), 44100 Hz, stereo, fltp, 95 kb/s (default)
  
  Metadata:
  
  creation_time : 2016-03-17 10:27:42
  
  handler_name : IsoMedia File Produced by Google, 5-11-2011
  
  Codec AVOption preset (Set the encoding preset (cf. x264 --fullhelp)) specified for output file #0 (/var/www/html/files/videos/2017/05/27/14958856828d300-sd.mp4) has not been used for any stream. The most likely reason is either wrong type (e.g. a video option with no video streams) or that it is a private option of some encoder which was not actually used for any stream.
  
  [flv @ 0x2506080] Either both buffer size and max rate or neither must be specified
  
  Output #0, mp4, to '/var/www/html/files/videos/2017/05/27/14958856828d300-sd.mp4':
  
  Metadata:
  
  major_brand : mp42
  
  minor_version : 0
  
  compatible_brands: isommp42
  
  Stream #0:0(und): Video: flv1, none, q=2-31, 128 kb/s, SAR 1:1 DAR 0:0, 25 fps (default)
  
  Metadata:
  
  handler_name : VideoHandler
  
  encoder : Lavc56.26.100 flv
  
  Stream #0:1(eng): Audio: mp3, 0 channels, 128 kb/s (default)
  
  Metadata:
  
  creation_time : 2016-03-17 10:27:42
  
  handler_name : IsoMedia File Produced by Google, 5-11-2011
  
  encoder : Lavc56.26.100 libmp3lame
  
  Stream mapping:
  
  Stream #0:0 -> #0:0 (h264 (native) -> flv1 (flv))
  
  Stream #0:1 -> #0:1 (aac (native) -> mp3 (libmp3lame))
  
  Error while opening encoder for output stream #0:0 - maybe incorrect parameters such as bit_rate, rate, width or height
  
  
  
  
  
  Sarting : MP4Box Conversion for SD
  
  
  
  MP4Box Command : /usr/local/bin/MP4Box -inter 0.5 /var/www/html/files/videos/2017/05/27/14958856828d300-sd.mp4 -tmp /var/www/html/files/temp
  
  
  
  output : Error opening file /var/www/html/files/videos/2017/05/27/14958856828d300-sd.mp4: IsoMedia File is truncated
  
  
  
  
  
  Conversion Status : Successful @ 2017-05-27 17:18:11
  
  
  
  
  
  output_format : mov,mp4,m4a,3gp,3g2,mj2
  
  
  
  output_duration : 62.09
  
  
  
  output_size : 4480694
  
  
  
  output_bitrate : 577316
  
  
  
  output_video_width : 640
  
  
  
  output_video_height : 360
  
  
  
  output_video_wh_ratio : 1.7777777777778
  
  
  
  output_video_codec : h264
  
  
  
  output_video_rate : 23.976023976024
  
  
  
  output_video_bitrate : 479302
  
  
  
  output_video_color : N/A
  
  
  
  output_audio_codec : aac
  
  
  
  output_audio_bitrate : 95999
  
  
  
  output_audio_rate : 44100
  
  
  
  output_audio_channels : 2
  
  
  
  output_path : /var/www/html/files/conversion_queue/14958856828d300.mp4
  
  
  
  output_rotation : 0
  
  
  
  
  
  Time Took : 9.2965 seconds
  
  
  
  conversion_status : completed 
  
  
  
  
  
  **Error Messages**
  
  
  
  Error while opening encoder for output stream #0:0 - maybe incorrect parameters such as bit_rate, rate, width or height
  
  
  
  output : Error opening file /var/www/html/files/videos/2017/05/27/14958856828d300-sd.mp4: IsoMedia File is truncated