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• avformat/mov : factorize reading the main part of the chnl atom to mov_chan

  9 février 2024, par Marton Balint

  avformat/mov : factorize reading the main part of the chnl atom to mov_chan
  Signed-off-by : Marton Balint <cus@passwd.hu>
  

  • [DH] libavformat/mov.c
  • [DH] libavformat/mov_chan.c
  • [DH] libavformat/mov_chan.h

• First input link main timebase (1/15360) do not match the corresponding second input link xfade timebase (1/90000)

  14 novembre 2023, par Rino

  coders

  


  I am new to ffmpeg and i am facing this error for more then 2 days.
This ffmpeg command :
!ffmpeg -i "{fromPath}" -i "{toPath}" -filter_complex "xfade=transition={chosenTransition}:duration={transitionDuration}:offset=-1.5" -c:v libx264 -crf 18 -preset veryfast "{outPath}"
I run that previous command 3 times in row where output of the previous command is input that is getting produced as 15360 timebase video i guess.

  


  is giving me this error : "First input link main timebase (1/15360) do not match the corresponding second input link xfade timebase (1/90000)"

  


  So when i merge two of my videos the output is video with (1/15360) timebase. Original videos has (1/90000) timebase.

  


  Pls help what i wana archive is basicly multiple videos inside a folder called "clips" merge together using a random transition from xfade/ffmpeg.

  


  On colab i tried all this ways :

  


  !rm -rf chunks
!mkdir chunks
time.sleep(1)
folderPath = '/content/clips'
videoOutput = '/content/test.mp4'
transitionDuration = 6

videoFiles = [f"{folderPath}/{f}" for f in os.listdir(folderPath) if f.endswith('.mp4')]
random.shuffle(videoFiles)
fromPath = videoFiles[0]
toPath = ''
outPath = ''
transitions = ['fade', 'wipeup', 'slidedown', 'circleclose', 'radial' , 'hrslice', 'hblur', 'smoothleft', 'smoothright']

for videoIndex, videoName in enumerate(videoFiles):
    if videoIndex == 0:
        continue
    toPath = videoName
    chosenTransition = random.choice(transitions)
    print('chosenTransition', chosenTransition)
    clipDuration = int((imageio.get_reader(fromPath)).get_meta_data()['duration']) - transitionDuration
    # !echo -i /content/clips/clip0.mp4 -i /content/clips/clip1.mp4 -filter_complex xfade=transition={chosenTransition}:duration=3:offset={clipDuration} dissolveVideo.mp4

    if videoIndex == len(videoFiles) - 1:
        outPath = videoOutput
    else:
        outPath = f'/content/chunks/chunk{videoIndex}.mp4'
    time.sleep(2)
    
    # !echo -i "{fromPath}" -i "{toPath}" -filter_complex "[0:v]xfade=transition={chosenTransition}:duration=3:offset={clipDuration},settb=1/19000[v0];[0:a][1:a]acrossfade=d=3[aout]" -map "[v0]" -map "[aout]" -c:v libx264 -crf 18 -preset ultrafast "{outPath}"
    !ffmpeg -i "{fromPath}" -i "{toPath}" -filter_complex "xfade=transition={chosenTransition}:duration={transitionDuration}:offset=-1.5,settb=1/15360" -c:v libx264 -crf 18 -preset veryfast "{outPath}"
    # !ffmpeg -i "{fromPath}" -i "{toPath}" -filter_complex "[0:v]settb=1/15360,setpts=PTS-STARTPTS[v0];[1:v]settb=1/15360,setpts=PTS-STARTPTS[v1];[v0][v1]xfade=transition={chosenTransition}:duration={transitionDuration}:offset=-1.5[vout]" -map "[vout]" -c:v libx264 -crf 18 -preset ultrafast "{outPath}"
    # !ffmpeg -i "{fromPath}" -i "{toPath}" -filter_complex "[0]settb=AVTB [0v]; [1]settb=AVTB [1v]; [0v] [1v]xfade=transition={chosenTransition}:duration={transitionDuration}:offset=1" -c:v libx264 -crf 18 -preset ultrafast "{outPath}"
    # !ffmpeg -i "{fromPath}" -i "{toPath}" -filter_complex "[0:v]xfade=transition={chosenTransition}:duration=3:offset={clipDuration},settb=1/15360[v0];[0:a][1:a]acrossfade=d=3[aout]" -map "[v0]" -map "[aout]" -c:v libx264 -crf 18 -preset ultrafast "{outPath}"
    # !ffmpeg -y -progress .progressinfo.dat -i "{fromPath}" -i "{toPath}" -filter_complex "[0:v]settb=AVTB,setpts=PTS-STARTPTS[v0];[1:v]settb=AVTB,setpts=PTS-STARTPTS[v1];[v0][v1]xfade=transition={chosenTransition}:duration={transitionDuration}:offset={clipDuration}[vout];[0:a]asettb=AVTB,asetpts=PTS-STARTPTS[a0];[1:a]asettb=AVTB,asetpts=PTS-STARTPTS[a1];[a0][a1]acrossfade=d=3[aout]" -map "[vout]" -map "[aout]" -c:v libx264 -crf 18 -preset ultrafast "{outPath}"



  


• avformat/electronicarts : add option to return alpha channel in the main video stream...

  13 novembre 2022, par Marton Balint

  avformat/electronicarts : add option to return alpha channel in the main video stream in VP6A codec
  VP6 alpha in EA format is a second VP6 encoded video stream where only the Y
  
  component is used and is interpreted as the alpha channel of the first VP6
  
  stream. The alpha VP6 stream is muxed separately from the main VP6 stream, has
  
  its own stream headers and packet headers. In theory the two streams might not
  
  even have the same resolution (although most likely that is not something that
  
  is seen or supported in the wild), but the format is capable of doing it.
  Merged VP6 alpha (also known as the VP6A codec) means that a packet of the
  
  video stream contains the corresponding packet of both VP6 substreams like
  
  this :
  OffsetOfAlpha, DataPacket, AlphaDataPacket
  So data and alpha data of a frame is merged to a single packet, this is how VP6
  
  video with alpha is muxed in FLV and SWF.
  The first approach is more like how the demuxer sees data in the EA format,
  
  unfortunately it is different to what the FLV or SWF format expects, so -
  
  having no better place for it in the framework - I decided to do an optional
  
  format conversion in the EA demuxer.
  Signed-off-by : Marton Balint <cus@passwd.hu>
  

  • [DH] doc/demuxers.texi
  • [DH] libavformat/electronicarts.c
  • [DH] libavformat/version.h