Sur d’autres sites (10445)

• Calculate edits in QuickTime Movie File with Edit List Atom

  8 juin 2016, par kodonnell

  In a Linux environment, is there a way to calculate any edits in a QuickTime Movie File track ? Specifically, I need duration and start time of edits in relation to the movie.

  I have been parsing the raw mov file to look at the Edit List Atom ( i.e. ’elst’ ) to get the track duration and media time but, even after the adjustments for time scale units the start time always seems off.

  For example, I have a single track video which has been edited to have first and last 6 seconds of the video removed. However, when I look at the ’elst’ atom of that file the track duration is the length of the new file but, the media time does not match what I would have expected (i.e. something equivalent to 6 seconds).

  I have tried looking into tools like FFmpeg but have had little success.

• Error using FFMPEG to create videos from a list of images

  3 août 2016, par user2308191

  I have a text file that contains the path of some images(the images are in order in the text file), the file looks like this :

  /home/Recording-Session-1456734351095_images/output_0001.png
  
  /home/Recording-Session-1456734351095_images/output_0002.png
  
  /home/annotations/rec_1456734351095/annotated_output_0003.png
  
  .......

  I want to use ffmpeg to create a video from these images. Here is the command I am using :

  ffmpeg -framerate 20 -f image2 -i images.txt -c:v libx264 -r 20 -pix_fmt yuv420p out.mp4

  but it gives me this error :

  [image2 @ 0x32ce7a0] Could not find codec parameters for stream 0 (Video: none, none): unknown codec
  
  Consider increasing the value for the 'analyzeduration' and 'probesize' options

  I tried different numbers for analyzeduration and probesize, but the error still exists, any idea what is the problem ?

• How to create a live stream in dash format from mp4 file or m3u8 list ? (ffmpeg)

  30 juin 2017, par jorge.luengo

  I have been trying different ways of running dash live streams from mp4 or m3u8 but none of them worked fined. I want to use ffmpeg because of my server conditions.
  This command has been the one that did something but it didn’t work as I expected :

  ffmpeg-3.3.2-64bit-static/ffmpeg -i reencoded24eng.mp4 -vf yadif=0 -r 30 -vcodec libx264 -keyint_min 60 -g 60 -b:v 1000k -ac 2 -strict 2 -acodec aac -ab 64k -map 0:v -map 0:a -f dash -min_seg_duration 2000  -use_template 1 -use_timeline 1 -init_seg_name init-\$RepresentationID\$.mp4 -dash 1  -media_seg_name test-\$RepresentationID\$-\$Number\$.mp4 test.mpd

  The error that the dash-if conformance tool provides is the following one :

  Start XLink resolving

  XLink resolving successful

  Start MPD validation

  MPD validation successful - DASH is valid !

  Start Schematron validation

  location="/[local-name()=’MPD’ and namespace-uri()=’urn:mpeg:dash:schema:mpd:2011’]/[local-name()=’Period’ and >namespace-uri()=’urn:mpeg:dash:schema:mpd:2011’]">
  If the MPD is dynamic the Period element shall have an id.

  location="/[local-name()=’MPD’ and namespace-uri()=’urn:mpeg:dash:schema:mpd:2011’]/[local-name()=’Period’ and >namespace-uri()=’urn:mpeg:dash:schema:mpd:2011’]/*local[1]">
  Common attributes for AdaptationSet and Representation shall either be in >one of the elements but not in both.

  Schematron validation not successful - DASH is not valid !

  BUILD SUCCESSFUL
  Total time : 5 seconds

  Could anyone help me with this ?