Recherche avancée

Sur d’autres sites (5367)

• ffmpeg in:h264 out:yuv to stdout - data format ?

  27 février 2019, par Petr

  I am (like many) trying to get a continuous series of still images out of the camera attached to a raspberry pi. I want to do this in java for all the usual reasons, and am using a Runtime exec command to pipe the output of raspivid to the following ffmpeg command, and then collecting the result via stdout --- note xxx.h264 is a test file generated by the camera that does not play because there is no container, but I am getting images out so half good.

  ffmpeg -i xxx.h264 -vcodec rawvideo -r 2 -pix_fmt yuv420p -f nut -

  I have some code displaying the frames, but they "march" across the display area from left to right, and there appears to be a growing amount of rubbish across the top of the images. I have looked at the bytes it outputs by running the same command and redirecting it into a file, then using vi/xxd and find that there is headder material ("nut/multimedia container ...").

  I am guessing that there is more metadata inserted by my ffmpeg command, that I am failing to remove when processing the raw yuv420p data as described here : https://en.wikipedia.org/wiki/YUV#Y%E2%80%B2UV420sp_%28NV21%29_to_RGB_conversion_%28Android%29

  For the life of me I cannot find the nut documentation anywhere in a readable format and anyway, it seems that is not what I should be looking for. Any pointers as to how I can recognise the frame boundaries in my byte stream ?

• Batch processing removal of closed captions in video files with ffmpeg [closed]

  3 octobre 2024, par user27616468

  I am trying to find an easier way of removing closed captions with ffmpeg from a lot of files, so far I have been using this and copy pasting file names in

  


  "C :\ffmpeg\bin\ffmpeg.exe" -i "E :\Videos.mkv" -bsf:v "filter_units=remove_types=6" -c copy "E :.mkv"

  


  Is there some way to make it do all files within the initial folder so I don't have to do each file name ?

  


  I have seen similar inquiries in regards to closed captions from 10+ years ago on this site but after a bit of using the search feature could not find anything that may relate to my specific need.

  


  This kind of thing is all new to me and there was a way to batch remove video titles easily but no idea how I would go about figuring the above out.

  


  Thank you for taking the time to read through my jibber jabba.

  


  This section is not currently applicable.

  


  I did see this thread but it is for subtitles and not closed captions and unfortunately with my limited knowledge I don't understand it.

  


  FFmpeg remove subtitles from file "if exists"

  


• dca_parser : don’t overwrite the sample rate, it may not be correct

  30 septembre 2015, par Hendrik Leppkes

  dca_parser : don’t overwrite the sample rate, it may not be correct
  The parser only reads the dca core sample rate, which is limited to a
  
  maximum of 48000 Hz, while X96 and HD extensions can increase the sample
  
  rate up to 192000 Hz.
  This change prevents the parser and decoder fighting over the sample rate,
  
  potentially confusing user applications. This also fixes sample rate
  
  display of >48000Hz files with ffmpeg/ffprobe when using libdcadec.
  Fixes ticket #4397
  

  • [DH] libavcodec/dca_parser.c