Sur d’autres sites (11491)

• Prevent libavformat (FFmpeg) from adding "ENCODER" tag to output / help stripping the tags

  9 juillet 2021, par Wyatt Ward

  I made a bash script that transfers audio or video metadata from one file to another, regardless of media container format, via FFMpeg. My problem is that FFMpeg consistently adds a 'ENCODER' tag.

  



  Example :

  



  Before running through FFMpeg :

  



   File : track01.cdda.flac

  



    Metadata:
    ALBUM           : Wish You Were Here
    ARTIST          : Pink Floyd
    COPYRIGHT       : 1975 Harvest Records
    DATE            : 1975
    GENRE           : Experimental Rock
    TITLE           : Shine On You Crazy Diamond
    track           : 1


  



  After running through FFMpeg :

  



   File : track01-iphone-alac.m4a

  



    Metadata:
    ALBUM=Wish You Were Here
    ARTIST=Pink Floyd
    COPYRIGHT=1975 Harvest Records
    DATE=1975
    GENRE=Experimental Rock
    TITLE=Shine On You Crazy Diamond
    track=1
    ENCODER=Lavf55.12.100


  



  So really, I want to either force FFMpeg to not add the 'ENCODER' tag, or I want to strip that tag off afterwards. Is there a way to do this ? I really don't want to spend hours trying to compile FFMpeg again on my Pentium 4 HT - the only working computer I have at the moment. I'd prefer not to have to use another program unless it's related enough to FFMpeg or MPlayer/Mencoder that I won't have to install anything new if I have those installed.

  


• FFMPEG Audio merging using the PHP library

  11 juin 2020, par Jesse

  I have been working with FFMPEG, still a beginner but I learnt alot.

  



  So I have to merge 2 audio's one that belongs to a video and one that is just an .mp3 file.
I got the correct shell exec, but now I want to use the FFMPEG php library.

  



  This is the correct (I think) and working shell command :

  



  /usr/bin/ffmpeg -y -i video-short.mp4 -i audio-short.mp3 -filter_complex "[0:a][1:a]amerge=inputs=2 [a]" -map 0:v -map "[a]" -c:v copy -c:a aac -ac 2 -b:a 128k video3-audio-output.mp4


  



  This outputs a video with 2 audio's.

  



  I got this figured after I made the php code and editing some of the outputted code so the script works.
Here is the php code, where I can't seem to figure out how to return the correct shell.

  



          $video = $this->ffmpeg->openAdvanced([
        'video-short.mp4',
        'audio-short.mp3'
    ]);
    $video
        ->filters()
        ->custom('[0:a][1:a]', 'amerge=inputs=', '2[a]' );
    $video
        ->map(array('0:v', '"[a]"'), new X264('aac'),
        'video3-audio-output.mp4'
    )
        ->save();


  



  Now I need to get the code to return something like the shell that does work, I've been trying for alot of hours.

  



  This is what my php returns it gives an encoding error, plus

  



  No channel layout for input 1

  



  /usr/bin/ffmpeg -y -i video-short.mp4 -i audio-short.mp3 -filter_complex [0:a][1:a]amerge=inputs=2[a] -map 0:v -map "[a]" -vcodec libx264 -acodec aac -b:a 128k video3-audio-output.mp4


  



  (EDIT)
So I added 'Copy' to FFMpeg\Format\Video\X264 getAvaiableVideoCodecs().

  



  If I add 'copy' to new X264('aac', 'copy') It does dump the correct Shell command, but it still crashes on "Encoding Failed"

  


• What is the most suitable H265 setting converting from H264 on ffmpeg ?

  9 juin 2017, par minion007

  Currently, I was trying to convert my videos no matter personal videos or movies from H264 to H265. But that was much harder than what I expected.

  Firstly, it took me over 10 hours to build ffmpeg on Linux and I believe I’m still having some problems on dealing with this.

  Secondly, I notice there is degradation after converting by using the setting or parameters from Internet or ffmpeg official website. On the other hand, the video size would be the same or even bigger than the original video size if I use small crf like 23 or 28.

  For instance, sudo ffmpeg -i input.mp4 -c:v hevc -x265-params lossless -preset medium -crf 30 -c:a copy output.mkv

  sudo ffmpeg -i input.mp4 -c:v libx265 -x265-params lossless -preset medium -crf 30 -c:a copy output.mkv

  the above two settings give me the very small video size (between 21% 23% of the original video) which is the main reason why I want to convert my videos to H265 but drawback would be the quality of converted video is worse than the original video (I would may be between 30% 35% degradation).

  Thirdly, the size of video would be much bigger than the original size of video if I use the lossless parameter.

  sudo ffmpeg -i input.mp4 -c:v libx265 -x265-params lossless=1 -preset medium -crf 30 -c:a copy output.mkv

  the above setting can keep the quality of the original video but size would be huge (above 200% of original video).

  Is there any suggestion ?