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• FFMPEG Stream via UDpxy and HDMI Grabber

  4 mars 2020, par Fabian Schäfer

  We use a HDMI Grabber and the manual from here : https://blog.danman.eu/reverse-engineering-lenkeng-hdmi-over-ip-extender/
  You can find the Script here : https://gist.github.com/danielkucera/0a2f36bc53959e4879cb567149aafb78

  Now we want to grab the Stream via FFMPEG and UDPxy to TVHeadEnd. But FFMPEG produces some Error as you can see below.

  FFMPEG Configuration :

  sudo ./recvlkv373.py 226.2.2.2 2068 /dev/stdout | ffmpeg -re -i pipe: -c:v h264 -c:a copy -f mpegts udp://239.0.0.1:1234

  [mjpeg @ 0x5578d5a232e0] error count: 73e1c90ea5aa3699
  
  [mjpeg @ 0x5578d5a232e0] error y=80 x=15
  
  frame=  746 fps= 25 q=28.0 size=     229kB time=00:00:27.48 bitrate=  68.2kbits/s speed=0.922frame=  758 fps= 25 q=28.0 size=     231kB time=00:00:27.96 bitrate=  67.7kbits/s speed=0.923frame=  771 fps= 25 q=28.0 size=     234kB time=00:00:28.48 bitrate=  67.2kbits/s speed=0.924frame=  783 fps= 25 q=28.0 size=     236kB time=00:00:28.96 bitrate=  66.7kbits/s speed=0.925frame=  796 fps= 25 q=25.0 size=     242kB time=00:00:29.48 bitrate=  67.2kbits/s speed=0.926frame=  809 fps= 25 q=28.0 size=     291kB time=00:00:30.00 bitrate=  79.5kbits/s speed=0.928frame=  821 fps= 25 q=28.0 size=     294kB time=00:00:30.48 bitrate=  79.1kbits/s speed=0.928frame=  834 fps= 25 q=28.0 size=     298kB time=00:00:31.00 bitrate=  78.8kbits/s speed=0.93xframe=  847 fps= 25 q=28.0 size=     301kB time=00:00:31.52 bitrate=  78.1kbits/s speed=0.931[mjpeg @ 0x5578d5a232e0] error count: 65b697ff00611d13
  
  [mjpeg @ 0x5578d5a232e0] error y=0 x=45
  
  frame=  859 fps= 25 q=28.0 size=     303kB time=00:00:32.00 bitrate=  77.5kbits/s speed=0.932frame=  872 fps= 25 q=28.0 size=     309kB time=00:00:32.52 bitrate=  77.8kbits/s speed=0.933[mjpeg @ 0x5578d5a232e0] error count: 6464e73ce47d9ba1e
  
  [mjpeg @ 0x5578d5a232e0] error y=73 x=10
  
  [mjpeg @ 0x5578d5a232e0] mjpeg_decode_dc: bad vlc: 0:0 (0x5578d5a2a328)
  
  [mjpeg @ 0x5578d5a232e0] error dc
  
  [mjpeg @ 0x5578d5a232e0] error y=74 x=38
  
  [mjpeg @ 0x5578d5a232e0] error count: 64cd4eab52d7b5de8

  When I do it Step by Step (Save the File via the Script and then transcode with FFMPEG) everything works fine.
  When I use a Pipe the Video Quality is bad with flicker.
  It only runs rudimentary good when I use a buffer, a crf higher than 35 and Youtube with Speed 0.25.

  First, it runs on a Raspberry Pi 3, now it is on a dedicated server. Is it possible that the Server still has not enough Power for it or is FFmpeg just limited ?
  OS : Ubuntu
  CPU : i7-3770k
  RAM : 8GB DDR3
  Graphic : Quadro M4000
  

  Have you some suggestions about what to change, that the stream would run better ?

• lavu/tx : support in-place FFT transforms

  10 février 2021, par Lynne

  lavu/tx : support in-place FFT transforms
  This commit adds support for in-place FFT transforms. Since our
  
  internal transforms were all in-place anyway, this only changes
  
  the permutation on the input.
  Unfortunately, research papers were of no help here. All focused
  
  on dry hardware implementations, where permutes are free, or on
  
  software implementations where binary bloat is of no concern so
  
  storing dozen times the transforms for each permutation and version
  
  is not considered bad practice.
  
  Still, for a pure C implementation, it's only around 28% slower
  
  than the multi-megabyte FFTW3 in unaligned mode.
  Unlike a closed permutation like with PFA, split-radix FFT bit-reversals
  
  contain multiple NOPs, multiple simple swaps, and a few chained swaps,
  
  so regular single-loop single-state permute loops were not possible.
  
  Instead, we filter out parts of the input indices which are redundant.
  
  This allows for a single branch, and with some clever AVX512 asm,
  
  could possibly be SIMD'd without refactoring.
  The inplace_idx array is guaranteed to never be larger than the
  
  revtab array, and in practice only requires around log2(len) entries.
  The power-of-two MDCTs can be done in-place as well. And it's
  
  possible to eliminate a copy in the compound MDCTs too, however
  
  it'll be slower than doing them out of place, and we'd need to dirty
  
  the input array.
  

  • [DH] doc/APIchanges
  • [DH] libavutil/tx.c
  • [DH] libavutil/tx.h
  • [DH] libavutil/tx_priv.h
  • [DH] libavutil/tx_template.c
  • [DH] libavutil/version.h

• Spaces in FFMPEG Input Thwart Execution

  2 septembre 2021, par Woolwit

  What's so baffling, is why spaces in the audio input seem to work fine, but spaces in the video input break things.
This fetches random images from a directory, pairs them with random audio clips and joins them into an mp4 video.

  


  def makeAudioImgMovs():
    randImgs = getImgs()
    compAudClips = makeAudioClips()
    audioJpgs = dict(zip(randImgs,compAudClips)) #Heres where we join the completed audio clips and the jpgs into a dict
    for jpg, aud in audioJpgs.items():
        print(f'The img is {jpg}, the type of the img is {type(jpg)} the aud is {aud} the type of the aud is {type(aud)}')
        subprocess.call('ffmpeg -hide_banner -loglevel error -loop 1 -i "{0}" -i "{1}"\
        -filter:v \
        "fade=in:st=0:d=1, fade=out:st=10:d=1,scale=720:480:force_original_aspect_ratio=decrease,pad=720:480:(ow-iw)/2:(oh-ih)/2,setsar=1" \
         -filter:a "afade=in:st=0:d=1, afade=out:st=10:d=1" \
        -c:v libx264 -t 11 -pix_fmt yuv420p -preset faster -shortest -c:a aac {2}.mp4'.format(jpg,aud,timePath/(pathlib.Path(jpg).stem)),shell=True)
makeAudioImgMovs()


  


  The print statement is writing what is in the dict of audioJpgs list. For example...

  


  The img is 2021-09-02-1-40/ponty_me.jpg, the type of the img is the aud is 2021-09-02-1-40/Jms Brn like it is like it was.aiff the type of the aud is

  


  The img is 2021-09-02-1-40/1966taxiToMassFromMomBack 2.tiff, the type of the img is the aud is 2021-09-02-1-40/Lola_Fay.mp3 the type of the aud is

  


  [NULL @ 0x7fe503021400] Unable to find a suitable output format for '2021-09-02-1-40/1966taxiToMassFromMomBack'
2021-09-02-1-40/1966taxiToMassFromMomBack : Invalid argument

  


  The img is 2021-09-02-1-40/1966taxiToMassFromMomBack 5.tiff, the type of the img is the aud is 2021-09-02-1-40/M Miller Lonnie's Lament.aiff the type of the aud is

  


  [NULL @ 0x7fd32a854c00] Unable to find a suitable output format for '2021-09-02-1-40/1966taxiToMassFromMomBack'
2021-09-02-1-40/1966taxiToMassFromMomBack : Invalid argument

  


  The img is 2021-09-02-1-40/10_021390_danny ? 1_jpg.jpg, the type of the img is the aud is 2021-09-02-1-40/i_got_to_rock.mp3 the type of the aud is

  


  [NULL @ 0x7f8449835800] Unable to find a suitable output format for '2021-09-02-1-40/10_021390_danny ?'
2021-09-02-1-40/10_021390_danny ? : Invalid argument

  


  The img is 2021-09-02-1-40/11_021390_danny_2_jpg.jpg, the type of the img is the aud is 2021-09-02-1-40/M Miller Power.aiff the type of the aud is

  


  The last pair of img/aud complete fine and write an mp4. Notice there, that the audio file has spaces in it !
Notice that the errors 'Invalid argument' get thrown where there is a space in the jpg file name.

  


  Help greatly appreciated.