Recherche avancée

Sur d’autres sites (9519)

• FFMPEG Update Command For Android 7

  4 juin 2019, par user2401847

  I have 300 images and i want to generate video from these images with Audio

  i am using below command to generate video

  ffmpeg -framerate 15 -i img_%d.jpg -i logo.png -i inputfile.mp3 -filter_complex \
  
  "[0:v][1:v] overlay=25:25:enable='between(t,0,20)'" \
  
  -vcodec libx264 -crf 25 -map 2:a -c:a copy -pix_fmt yuv420p -shortest test_video.mp4

  Which generates video with audio but video is not working for android 7 and above

  Log File (Android 6 - Working) https://drive.google.com/file/d/1uZEjcumY9qUACHvOSdW-3FxMQ66Gr7t4/view?usp=sharing

  Log file (Android 7 - not working ) https://drive.google.com/file/d/1QgFYjf-hr33LvIpDZBaV0KxyrO3Z9eUs/view?usp=sharing

• HEVC/H.265 interlaced format support in ffmpeg or VLC

  30 décembre 2020, par Ernestas Gruodis

  "Music Box Russia" channel over satellite transmits in HEVC 1920x1080 25fps interlaced - and after recording VLC recognizes file as 50 fps, and resolution 1920x540 - half a height. But on satellite tuner the player works fine - it plays a file as 1920x1080 25fps... When we can expect support for HEVC/H.265 interlaced ? Here is recorded file (Garry Grey & Eva Miller - wtf). Also - a lot of lost frames in VLC player statistics..

  


  EDIT :

  


  I found some interesting info how in HEVC the interlace video content can be indicated here :

  


  


  Unlike to H.264/AVC, interlace-dedicated coding in HEVC is not exist :

  


  

  • No mixed frame-field interaction (like PAFF in H.264/AVC)

  


  • No interlace scanning of transform coefficients

  


  • No correction MVX[1] (or y-component of MV) if current and reference pictures are in different polarity (top-bottom or
bottom-top).

  


  


  However, in HEVC the interlace video content can be indicated
(signaled in VPS/SPS and pic_timing SEI messages the latter are
transmitted for every picture in the sequence). Interlace-related
setting :

  


  


  • in VPS/SPS set general_interlaced_source_flag=1 and general_progressive_source_flag=0. Indeed, the HEVC standard says :

    


    if general_progressive_source_flag is equal to 0 and
general_interlaced_source_flag is equal to 1, the source scan type of
the pictures in the CVS should be interpreted as interlaced only.

    


  


  • in VPS/SPS set general_frame_only_constraint_flag=0

    


  


  • in SPS VUI set field_seq_flag=1 and frame_field_info_present_flag=1. Notice that if these flags are ON
then picture timing SEIs shall be present for each picture.

    


  


  • transmission of Picture Timing SEI per picture with the following parameters :

    


    source_scan_type = 0 to indicate interlace mode
for top field picture signal pict_struct=1 and for bottom field picture pict_struct=2

    


  


  


  


  Perhaps it is possible to pass these parameters to ffmpeg/vlc before playing a file ?

  


• ffmpeg - Dynamic letters and random position watermark to video ?

  2 avril 2016, par sekmo

  I am making an online course, and to avoid piracy distribution I thought to put watermarks on the videos (including personal user information) so it cannot upload to sharing websites. Now the hard part : I would move the watermark during the video, in 3/4 random positions, every 30 seconds.
  It is possibile with ffmpeg ?