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• avcodec/mpegvideo_dec, rv34 : Simplify check for "does pic exist ?"

  28 avril 2024, par Andreas Rheinhardt

  avcodec/mpegvideo_dec, rv34 : Simplify check for "does pic exist ?"
  The days in which an MPVPicture* is set with the corresponding frame
  
  being blank are over ; this allows to simplify some checks.
  Signed-off-by : Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
  

  • [DH] libavcodec/mpegvideo_dec.c
  • [DH] libavcodec/rv34.c

• How to batch insert same clip scene at the beginning of multiple videos ?

  13 juin 2013, par FLYqtFLY

  I have been for a few days researching on a suitable auto or semi-automatic way of mass merging files this way. Basically, what I want to achieve is inserting the same clip, before a bunch of other clips.

  In this case I´ve been trying with .flv, .mp4, .avi files (always merging same codecs), and I didn´t succeed after testing all the programs available in both Windows and OSx. Believe me, I´ve tried them all. The only ones which are supposed to handle quite well this quite of tasks are from Videocharge : Watermark Master and Videocharge Studio. None of them could perform correctly the task. Maybe there was some way I could have achieved this by scripting with After Effects or Sony Vegas, I just didn´t find any.

  Now I´m trying to find some way to achieve the same thing either by shell, unix scripting... I don´t care. I just don´t want to mount Ubuntu only for these tasks. I´m not a programmer, but I´m quite stuborn (which sometimes leads me to neverending nights) so I would appreciate some help or guidance from anyone keen and good enough on batch video processing or scripting.

  Right now, the only useful paths I´ve found drive me into either using mencode or ffmpeg through commands, but I am not able to perform the merge on batch. I don´t care about the way to sort the videos out. But taking into consideration that the operation would be performed on hundreds or thousands of videos, it wouldn´t be suitable to have them all in separate folders each accompanied by the "unique" intro clip. I guess that the most logic way would be storing the "bunch" videos in a folder, and the intro clip on the same folder as the encoder or renderer.

  Thanks in advance for any help or guidance,

• Using FFmpeg, How to convert an frame image sequence to video(video codec : dvvideo) ?

  25 mai 2022, par ruping

  I'm working on an image processing project.

  


  The project proceeds as follows :

  


  Input Video -> frame Sequence -> (Processing) -> Output Video

  


  I want to create the output video with the same specifications as the input video.

  


  The specs of the input video we use are :

  


  - Size : 1280x1080, Codec : dvvideo, pixel_fmt : yuv422


  


  But I am struggling with the following error :

  


  Duration: 00:00:03.20, start: 0.000000, bitrate: N/A
    Stream #0:0: Video: png, rgb24(pc), 1280x1080 [SAR 3:2 DAR 16:9], 29.97 fps, 29.97 tbr, 29.97 tbn, 29.97 tbc
Stream mapping:
  Stream #0:0 -> #0:0 (png (native) -> dvvideo (native))
Press [q] to stop, [?] for help
[dvvideo @ 0x55b965b745c0] DVCPRO HD encoding is not supported.
[dvvideo @ 0x55b965451780] ff_frame_thread_encoder_init failed
Error initializing output stream 0:0 -- Error while opening encoder for output stream #0:0 - maybe incorrect parameters such as bit_rate, rate, width or height
Conversion failed!


  


  The code is below. (subprocess in python)

  


  ffmpeg -y -f image2 -r "{fps}" -i {input_img_root} -s 1280:1080 -b:v {bit_rate}  -vcodec dvvideo -pix_fmt yuv422p "{output}"


  


  (fps and bitrate are taken from the input video. and input_img_root and output are paths.)

  


  I've been trying for several days, but it doesn't work.

  


  If you know any way to make a new video while maintaining the video specifications (Especially dvvideo codec)(not using ffmpeg), it would be nice to share it.