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• Problems cropping videos with ffmpeg -ss -t

  8 décembre 2016, par Alex Bollbach

  I have been trying to figure out how to precisely crop out sub-sections of a video final.mp4, for example a cropped video with range [0.2, 0.28] or [9.1, 10.2]. So I’ve been using ffmpeg with -ss and -t options. The following command (or some similar form) is what I’ve seen prescribed :

  ffmpeg -y -i final.mp4 -ss 00:00:01 -t 00:00:01.5 -acodec copy -vcodec copy crop1.mp4

  What I expect is a cropped video of length 1.5 starting at time 1.0, but I get a broken video that doesn’t play. Or I’ll try :

  ffmpeg -y -i final.mp4 -ss 1 -c copy -t 1.5 crop1.mp4

  and get a video with the audio cropped to 1.5 seconds but the video lasting much longer freeze framed.

  The point is this should be a relatively straightforward operation but I’m running into problems at every turn. What is wrong with these commands ? My original video is a 7 minute youtube ripped mp4 which I trimmed down to 10 seconds (this seemed to work). But now further finer-grain trimming of that video is showing confusing behavior. Perhaps my video file is somehow in a bad state from the first trimming ?

• Writing metadata (Artist Name, Song Title, Year, Album, Duration, Genre) to mp3/m4a audio file using youtube-dl (subsequent AtomicParsely error)

  10 décembre 2016, par IRNotSmart

  I am extracting audio only from youtube videos using youtube-dl. I would like to write the metadata (i.e. Artist Name and Song Title, Year, Album, Duration, Genre) into the mp3/m4a file after downloading. My attempt to accomplish this starts with this code :

  @echo off
  
  youtube-dl --format m4a/mp3 --youtube-skip-dash-manifest --embed-thumbnail -o "%%(title)s.%%(ext)s" --metadata-from-title "%%(artist)s - %%(title)s" --add-metadata 2Y6Nne8RvaA
  
  pause

  This code produces the following output :

  [youtube] 2Y6Nne8RvaA: Downloading webpage
  
  [youtube] 2Y6Nne8RvaA: Extracting video information
  
  [youtube] 2Y6Nne8RvaA: Downloading thumbnail ...
  
  [youtube] 2Y6Nne8RvaA: Writing thumbnail to: Kungs vs Cookin' on 3 Burners - Thi
  
  s Girl.jpg
  
  [download] Destination: Kungs vs Cookin' on 3 Burners - This Girl.m4a
  
  [download] 100% of 2.99MiB in 00:01
  
  [ffmpeg] Correcting container in "Kungs vs Cookin' on 3 Burners - This Girl.m4a"
  
  
  
  [fromtitle] parsed title: This Girl
  
  [fromtitle] parsed artist: Kungs vs Cookin' on 3 Burners
  
  [ffmpeg] Adding metadata to 'Kungs vs Cookin' on 3 Burners - This Girl.m4a'
  
  ERROR: AtomicParsley was not found. Please install.
  
  Press any key to continue . . .

  As you can see, I am able to successfully able to add a few of the tags from the video, but not all of them and the Year is royally screwed up.
  

  What is this AtomicParsely error and how do I remedy it ? Do I need this program to correctly add all the Metadata to the file that I want, or can this be accomplished in another way ?

  Referencing Steven Penny’s post, FFmpeg metadata not showing in Windows ?, is solving this problem as simple as using an ffmpeg command ?

  When I do a google search for this song, the first link that shows is the exact link I’m using on YouTube, and the search shows pertinent metadata (see below). I’m not sure if this data is input manually by users, or if Google mined this from the video :
  

  I admit that I’m new to using youtube-dl and ffmpeg, but with the help of the commenters on StackOverflow, I’m learning more each day. This post is a follow-up to my previous question : Downloading YouTube to mp3 and writing metadata (artist/song title) to mp3 file using youtube-dl

• FFMPEG format settings for android

  24 juillet 2016, par Jemil Riahi

  String[] args = {
  
            "-i" ,
  
            path,
  
            "-codec:v",
  
            "libx264",
  
            "-profile:v",
  
            "high",
  
            "-preset",
  
            "slow",
  
            "-b:v",
  
            "500k",
  
            "-maxrate",
  
            "500k",
  
            "-bufsize",
  
            "1000k",
  
            "-vf",
  
            "scale=-1:480",
  
            "-threads",
  
            "0",
  
            "/storage/emulated/0/Download/testing.mp4"
  
  };

  This is the format i am going for. It works fine on some videos. But it failed on one.

  Error code (Dont know why it is so tabbed out)

  configuration: --target-os=linux --cross-prefix=/home/vagrant/SourceCode/ffmpeg-android/toolchain-android/bin/arm-linux-androideabi- --arch=arm --cpu=cortex-a8 --enable-runtime-cpudetect --sysroot=/home/vagrant/SourceCode/ffmpeg-android/toolchain-android/sysroot --enable-pic --enable-libx264 --enable-libass --enable-libfreetype --enable-libfribidi --enable-libmp3lame --enable-fontconfig --enable-pthreads --disable-debug --disable-ffserver --enable-version3 --enable-hardcoded-tables --disable-ffplay --disable-ffprobe --enable-gpl --enable-yasm --disable-doc --disable-shared --enable-static --pkg-config=/home/vagrant/SourceCode/ffmpeg-android/ffmpeg-pkg-config --prefix=/home/vagrant/SourceCode/ffmpeg-android/build/armeabi-v7a --extra-cflags='-I/home/vagrant/SourceCode/ffmpeg-android/toolchain-android/include -U_FORTIFY_SOURCE -D_FORTIFY_SOURCE=2 -fno-strict-overflow -fstack-protector-all' --extra-ldflags='-L/home/vagrant/SourceCode/ffmpeg-android/toolchain-android/lib -Wl,-z,relro -Wl,-z,now -pie' --extra-libs='-lpng -lexpat -lm' --extra-cxxflags=
  
      libavutil      55. 17.103 / 55. 17.103
  
      libavcodec     57. 24.102 / 57. 24.102
  
      libavformat    57. 25.100 / 57. 25.100
  
      libavdevice    57.  0.101 / 57.  0.101
  
      libavfilter     6. 31.100 /  6. 31.100
  
      libswscale      4.  0.100 /  4.  0.100
  
      libswresample   2.  0.101 /  2.  0.101
  
      libpostproc    54.  0.100 / 54.  0.100
  
    Input #0, mov,mp4,m4a,3gp,3g2,mj2, from '/storage/emulated/0/Download/big_buck_bunny_720p_50mb.mp4':
  
      Metadata:
  
        major_brand     : isom
  
        minor_version   : 512
  
        compatible_brands: isomiso2avc1mp41
  
        creation_time   : 1970-01-01 00:00:00
  
        encoder         : Lavf53.24.2
  
      Duration: 00:04:41.90, start: 0.000000, bitrate: 1488 kb/s
  
        Stream #0:0(und): Video: h264 (Main) (avc1 / 0x31637661), yuv420p, 1280x720 [SAR 1:1 DAR 16:9], 1100 kb/s, 25 fps, 25 tbr, 12800 tbn, 50 tbc (default)
  
        Metadata:
  
          creation_time   : 1970-01-01 00:00:00
  
          handler_name    : VideoHandler
  
        Stream #0:1(und): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, 5.1, fltp, 383 kb/s (default)
  
        Metadata:
  
          creation_time   : 1970-01-01 00:00:00
  
          handler_name    : SoundHandler
  
    [libx264 @ 0xf70c4800] width not divisible by 2 (853x480)
  
    Output #0, mp4, to '/storage/emulated/0/Download/testing.mp4':
  
      Metadata:
  
        major_brand     : isom
  
        minor_version   : 512
  
        compatible_brands: isomiso2avc1mp41
  
        encoder         : Lavf53.24.2
  
        Stream #0:0(und): Video: h264, none, q=2-31, 128 kb/s, SAR 2560:2559 DAR 0:0, 25 fps (default)
  
        Metadata:
  
          creation_time   : 1970-01-01 00:00:00
  
          handler_name    : VideoHandler
  
          encoder         : Lavc57.24.102 libx264
  
        Stream #0:1(und): Audio: aac, 0 channels, 128 kb/s (default)
  
        Metadata:
  
          creation_time   : 1970-01-01 00:00:00
  
          handler_name    : SoundHandler
  
          encoder         : Lavc57.24.102 aac
  
    Stream mapping:
  
      Stream #0:0 -> #0:0 (h264 (native) -> h264 (libx264))
  
      Stream #0:1 -> #0:1 (aac (native) -> aac (native))
  
    Error while opening encoder for output stream #0:0 - maybe incorrect parameters such as bit_rate, rate, width or height

  As i got it. It complains that [libx264 @ 0xf70c4800] width not divisible by 2 (853x480) I have no idea how to fix this issue so that every video can work.

  The inspiration i got for my format settings comes from :
  https://www.virag.si/2012/01/web-video-encoding-tutorial-with-ffmpeg-0-9/

  Does anyone have any tips on what i should do to fix this.