Recherche avancée

Sur d’autres sites (2807)

• libavformat/mxfenc : color_range should be inclusive

  20 août 2020, par Harry Mallon

  libavformat/mxfenc : color_range should be inclusive
  MXF CDCI color range was being set to (1<<sc->component_depth) - 1
  
  for full range but it should be (1<<sc->component_depth) as 0 is
  
  a valid value.
  Signed-off-by : Harry Mallon <harry.mallon@codex.online>
  

  • [DH] libavformat/mxfenc.c

• How to automatically add date to output file generated in ffmpeg ?

  4 avril 2019, par Maxime Richard

  I am using Terminal to run ffmpeg commands (Mac OS) in order to record radio shows streamed online. The stream is in m3u8 I want to output it in mp3. So far so good, I am able to achieve that. However, I’d like the output file to read YYYYMMDD-fm93-segal.mp3 where YYYYMMMDD are the date the recording was made.

  I am not able to achieve this using -strftime 1 for some reason. When using my code, the output file reads %Y%m&d-fm93-segal.mp3 instead of replacing the strings by the real date.

  Here is the line I’m using :

  ffmpeg -i "https://cogecomedia.leanstream.co/cogecomedia/CJMFFM.stream/playlist.m3u8" -acodec mp3 -strftime 1 "%Y%m%d-fm93-segal.mp3" 

  Anyone knows why and could help me with that ?

• Bugs converting animated GIFs to AVIF in PHP ?

  12 octobre 2023, par xgretsch

  I am running PHP 8.1 under Linux 23:04, and I would like to convert animated GIFs to AVIFs, since these are much smaller and Google Search Console is complaining about my LCP. I'm following the method in https://codelabs.developers.google.com/codelabs/avif#0.

  


  I have been able to do this for most files using the avifenc encoder, installed by :

  


  RUN apt-get install -y ffmpeg libavif-bin


  


  However, I have at least one file (https://storage.googleapis.com/bachtrack-public/temp/problem.gif) that breaks the encoder. The output looks something like this :

  


  # ffmpeg -i problem.gif -pix_fmt yuv420p -f yuv4mpegpipe problem.gif.y4m
(lots of diagnostic output, correct conclusion)
# avifenc problem.gif.y4m problem.avif
Successfully loaded: problem.gif.y4m
AVIF to be written: (Lossy)
 * Resolution     : 200x200
 * Bit Depth      : 8
 * Format         : YUV420
 * Chroma Sam. Pos: 0
 * Alpha          : Absent
 * Range          : Limited
 * Color Primaries: 1
 * Transfer Char. : 13
 * Matrix Coeffs. : 6
 * ICC Profile    : Absent
 * XMP Metadata   : Absent
 * Exif Metadata  : Absent
 * Transformations: None
 * Progressive    : Unavailable
Encoding with AV1 codec 'aom' speed [6], color QP [24 (Medium) <-> 26 (Medium)], alpha QP [0 (Lossless) <-> 0 (Lossless)], tileRowsLog2 [0], tileColsLog2 [0], 1 worker thread(s), please wait...
 * Encoding frame 1 [1/1 ts]: problem.gif.y4m
 * Encoding frame 2 [1/1 ts]: problem.gif.y4m
(lots more frames)
 * Encoding frame 39 [1/1 ts]: problem.gif.y4m
avifenc: ./av1/encoder/pass2_strategy.c:4045: av1_twopass_postencode_update: Assertion `cpi->twopass_frame.stats_in > twopass->stats_buf_ctx->stats_in_start' failed.
Aborted
#avifenc -V
Version: 0.11.1 (dav1d [dec]:1.0.0, libgav1 [dec]:0.18.0, aom [enc/dec]:v3.6.0, rav1e [enc]:0.5.1 (v0.5.1), svt [enc]:v1.4.1)
libyuv : available (1838)
#


  


  The version of avifenc isn't the latest, but I haven't succeeded in rebuilding it from source using Google's instructions – I eventually land with a library that I can't find anywhere.

  


  I have tried PHP ImageMagick using the code below, but that loses the animation :

  


  $imagick = new Imagick('problem.gif');
$imagick->writeImage('problem.avif');


  


  Can anyone help ? The solution could be to install a newer version of avifenc, or to make ImageMagick work with the animation, or to use some different library altogether...