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Sur d’autres sites (11061)

  • How to delete one specific stream out of two audio streams from multiple video files of same properties using python ?

    8 avril 2015, par Anvesh Kurapati

    I have a folder with 200(or more) video files, each approximately 70MB in size(which doesn’t matter), and contain one video, one text and two audio streams, and audio streams belong to two different languages. All the files have the same two language audio streams. So how to delete one specific audio stream of the language of user’s choice, from each file, and keep everything else intact. For a single file, I could’ve used mkvcleaver or some other GUI tools. Or even ffmpeg. But as its repetitive, as in Zen of python, I am thinking it could be automated. How do I do it in Python 3.4 ?

  • Issue with yt-dlp and FFMPEG Converting Webm to MP4 for 360 video : Unsupported channel layout "ambisonic 1"

    22 janvier 2024, par William L W L

    I am trying to convert .webm files to mp4. These are 360 videos that have been downloaded using yt-dlp.

    


    I have been using this command successfully, but it does not work on an M2 macbook pro. It works fine on PC.

    


    ffmpeg -y -i "/Users/x/Movies/Tropical_Rainforest_360.webm" -c:v libx265 -preset fast -crf 21 -vf "scale=4096x4096:out_range=full" -pix_fmt yuvj420p -aspect 1:1 -movflags faststart "/Users/x/Movies/Tropical_Rainforest_360.mp4"


    


    The error messages are as follows :

    


    [aac @ 0x12ae1fea0] Unsupported channel layout "ambisonic 1"
[aac @ 0x12ae1fea0] Qavg: nan
[aost#0:1/aac @ 0x12ae1fc30] Error while opening encoder - maybe incorrect parameters such as bit_rate, rate, width or height.
Error while filtering: Invalid argument
[swscaler @ 0x110dd0000] deprecated pixel format used, make sure you did set range correctly
[swscaler @ 0x120158000] deprecated pixel format used, make sure you did set range correctly
[swscaler @ 0x130208000] deprecated pixel format used, make sure you did set range correctly
    Last message repeated 1 times
[out#0/mp4 @ 0x600003f8c480] Nothing was written into output file, because at least one of its streams received no packets.
frame=    0 fps=0.0 q=0.0 Lsize=       0kB time=N/A bitrate=N/A speed=N/A    
Conversion failed!



    


    Context : I work in an educational setting which caters for vulnearble pupils. We cannot use Youtube in real time, this is mainly due to adverts or suggested videos that may trigger our pupils. Some children have mental health issues. Some children have also not been outdoors for several months/years due to medical conditions. We use 360 videos and VR to help bring the outside world inside, The YoutubeVR app is not an option since there is no way to install adblockers.

    


    The same script above works fine on a PC virtual machine which I can remote into from my Mac.

    


  • How can I setup PIDs using ffmpeg & MP4 Container ?

    11 août 2021, par Manoel Rocha

    Is there anyone who could help me with a simple hint regarding MP4 container ?

    


    Basically I got all the results I need, I just need a help to understand how to define PIDs (or component IDs) for each track inside the container.

    


    The command I'm using :

    


    ffmpeg -i source.mov -c:v libx264 -preset veryfast -b:v 20000K -minrate 20000K -maxrate 20000K -bufsize 40000K -bf 2 -qcomp 0.0 -keyint_min 25  -g 15 -pix_fmt yuv420p -color_trc bt709 -color_primaries bt709 -r 30000/1001 -profile:v high -level 4.1 -bsf:v 'filter_units=remove_types=6' -movflags faststart -metadata:s:v:0 language=eng -metadata:s:v:0 title="Video" -filter_complex "[0] scale=1920:1080" -filter_complex "[0:3][0:1][0:2][0:4][0:5][0:6]join=inputs=6:channel_layout=5.1,loudnorm=I=-23:TP=-1.0:LRA=20" -filter_complex "[0:9][0:7][0:8][0:10][0:11][0:12]join=inputs=6:channel_layout=5.1,loudnorm=I=-23:TP=-1.0:LRA=20" -c:a ac3 -b:a:0 448k -b:a:1 448k -metadata:s:a:0 language=eng -metadata:s:a:0 title="AC-3 5.1" -metadata:s:a:1 language=por -metadata:s:a:1 title="AC-3 5.1" -streamid 0:0x01E1 -streamid 1:0x01E2 -streamid 2:0x01E3 -f mp4 output.mp4


    


    My output file is a MP4 but tracks IDs are 1 (video), 2 (1st audio), 3 (2nd audio).

    


    How can I change these IDs to 101, 201 and 202 ?

    


    Many thanks for your time !

    


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