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• Evolution #4063 : Position de la prévisualisation / ergo presentation formulaire forum

  12 février 2021, par b b

  mais le rendu est encore vraiment moyen, on a des kilometres de blanc entre "Un message un commentaire" et les checkbox de mots cles parce que les fieldset ont des tonnes de margin partout et s’enchainent.

  Je ne vois pas où est la prévisu dans ton image....

  Et puis bon, l’exemple tiré par les cheveux avec 48 mots clés affichés dans le forum est certainement bien loin du cas d’usage "classique", non ?

• FFMPEG Layering two .mov files color issue

  21 février 2023, par JDC

  I have two folders containing numbered .mov files all the same length, one folder for front and one for back. I'm using ffmpeg to combine the front and back videos with matching numbers into one output video (the front video has an alpha channel). The below command works, but in the output video the front layer has slightly incorrect colors compared to the input (reds are too yellow for example). The back layer in the output looks correct. Both input files use the bt709 color space (checked with ffprobe). Is there something in the overlay options which is causing the front layer to look incorrect, or something I'm doing wrong with the colorspace options ?

  


  


  for f in Video_Back/Video_Back_*.mov ; do
num=$(echo "$f" | sed -n 's/.*Video_Back_([0-9]5).mov$/\1/p')
if [ -f "Video_Front/Video_Front_$num.mov" ] ; then
ffmpeg -color_primaries bt709 -color_trc gamma28 -colorspace bt709 -i "$f" -color_primaries bt709 -color_trc gamma28 -colorspace bt709 -i "Video_Front/Video_Front_$num.mov" -filter_complex "[1:v]format=rgba[fg] ;[0:v][fg]overlay=shortest=1:alpha=straight,eq=gamma=1.0[mixed]" -map "[mixed]" -map 0:a:0 -c:v libx264 -crf 18 -preset veryfast -c:a copy "Video_Merged/Video_Merged_$num.mp4"
fi
done

  


  


• Large HLS Stream to MP4 Clip using FFMPEG

  6 mars 2021, par Brandon Price

  I'm trying to create a clip from an HLS stream. The HLS stream is 8 hours long and the clip can be hours into the video. At most the clip is going to be 1 minute. Most similar answers on here convert the entire video to an mp4 which will take a very long time. Here's what I have so far :

  


  ffmpeg -live_start_index 0 -ss 05:22:19.82667 -i https://example.com/main.m3u8 -t 00:00:55.65625 output.mp4

  


  I like this implementation so far because ffmpeg seeks to the desired position in the playlist 5 hours into the video before it starts pulling down segments.

  


  The problem with this is that I've noticed oftentimes the first few seconds of video is paused (my guess because ffmpeg sees a keyframe only every 6 seconds). Any help would be much appreciated !