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• yt-dlp : ffmpeg working for some videos, but not for the others

  30 janvier 2023, par Mikki99

  I started using yt-dlp a few days ago, so I'm new to the whole thing. I needed to download some videos from youtube, but have them split into chapters.

  


  The command :

  


  yt-dlp --split-chapters URL


  


  seems to be doing the right thing. However, running exactly the same command works for some videos, but for some I get the following error :

  


  ERROR: Postprocessing: ffmpeg not found. Please install or provide the path using --ffmpeg-location 'list' is not recognized as an internal or external command, operable program or batch file.


  


  I have previously installed ffmpeg and added it to the PATH and it worked fine, and it doesn't make much sense to me that the command would work for certain URLs if ffmpeg wasn't there.

  


  The video for which the error comes up is no different than the one for which the command works. They both have chapters.

  


  Also, I don't really understand this last part of the error message

  


  'list' is not recognized as an internal or external command, operable program or batch file


  


  Does anyone have an idea what might be happening ?

  


  Please do let me know if there is something else I should share — I'll edit the original post !

  


  Thanks a lot !

  


  I've tried running the command on different short (couple mins long) videos that included chapters (just so the download doesn't take a lot of time). It worked for numerous arbitrary videos I found on youtube. The video that I am actually interested in is 40 min long (suppose that doesn't make any difference), but for this video (or others from this playlist) I run into the mentioned error. Here is the link to the video, if you want to try it out yourself.

  


• FFMPEG SAR mismatch when concatenating videos

  6 septembre 2020, par marcman

  I'm trying to concatenate videos with different codecs using the concat filter. I'm also doing a bunch of processing to scale and pad the individual clips in this filter as well. However, I keep getting an error of this form :

  


  [Parsed_concat_14 @ 0x556b918ed580] Input link in1:v0 parameters (size 960x1280, SAR 0:1) do not match the corresponding output link in0:v0 parameters (1280x720, SAR 1:1)


  


  Here is my command :

  


  ffmpeg \
    -y \
    -loglevel warning \
    -stats \
    -i videos/vid0.mp4 \
    -i videos/vid1.mp4 \
    -i videos/vid2.mov \
    -filter_complex \
"[0:v]setpts=PTS-STARTPTS, scale=1920:1080, setsar=1, drawtext=expansion=strftime: basetime=$(date +%s -d'2020-07-10 16:04:44')000000 : fontcolor=white : text='%^b %d, %Y%n%l\\:%M%p' : fontsize=36 : y=1080-4*lh : x=1920-text_w-2*max_glyph_w; \
[1:v]setpts=PTS-STARTPTS, scale=810:1080, pad=width=1920:height=1080:x=555:y=0:color=black, setsar=1, drawtext=expansion=strftime: basetime=$(date +%s -d'2020-08-20 21:12:27')000000 : fontcolor=white : text='%^b %d, %Y%n%l\\:%M%p' : fontsize=36 : y=1080-4*lh : x=1365-text_w-2*max_glyph_w; \
[2:v]setpts=PTS-STARTPTS, scale=607:1080, pad=width=1920:height=1080:x=656:y=0:color=black, setsar=1, drawtext=expansion=strftime: basetime=$(date +%s -d'2020-08-27 16:42:26')000000 : fontcolor=white : text='%^b %d, %Y%n%l\\:%M%p' : fontsize=36 : y=1080-4*lh : x=1263-text_w-2*max_glyph_w; \
[0:v][0:a][1:v][1:a][2:v][2:a]concat=n=3:v=1:a=1[v][a]" \
    -map "[v]" \
    -map "[a]" \
    videos.mp4


  


  This gives the following error :

  


  [Parsed_concat_14 @ 0x563ab9d840c0] Input link in1:v0 parameters (size 960x1280, SAR 0:1) do not match the corresponding output link in0:v0 parameters (1280x720, SAR 1:1)
[Parsed_concat_14 @ 0x563ab9d840c0] Input link in2:v0 parameters (size 1080x1920, SAR 0:1) do not match the corresponding output link in0:v0 parameters (1280x720, SAR 1:1)


  


  The input videos have these resolutions :

  


  

  1. vid0.mp4 : (1280x720)

  


  2. vid1.mp4 : (960x1280)

  


  3. vid2.mp4 : (1080x1920)

  


  


  The output resolution of the concatenated output is to be 1920x1080.

  


  I've added the setsar=1 command after all my scaling and padding operations, as per this question and answer. I've also tried setdar=16/9 as in this answer, but it made no difference.

  


  What am I missing here ?

  


• Combining videos with ffmpeg using crossfades and plain cuts

  9 mars 2016, par Zach

  I am writing a script to combine/slice arbitrary video files from S3 into one output video. So far, I am doing this by first trimming the videos to their proper length using ffmpeg -i input-X.mp4 -ss start -t duration slice-X.mp4 and recombining the resultant slices with the ffmpeg concat filter.

  I want to be able to crossfade and cut between videos. concat does not support transitions. What is the best way to combine videos with crossfades and cuts on the Linux command line ? Is ffmpeg the best tool for the job ?

  My question is similar to "How do you create a crossfade transition between multiple videos in FFMPEG ?" but I do not necessarily need to use ffmpeg. Also, I want to be able to fade in between some slices and cut between others.