Recherche avancée

Sur d’autres sites (18180)

• How can I combine a screenshot and two video files with ffmpeg ?

  26 novembre 2023, par lukascbossert

  I have a folder with video files. Some are .mov, some are .mp4. As a first step I am converting the .mov-files into .mp4 with :

  


  while read mov; do
   mp4=$(echo "$mov"|sed -e 's|\.mov$|.mp4|i')
   if [ "$mov" == "$mp4" ]; then
     echo "Failed to generate unique MP4 filename for file $mov"
   fi
   ffmpeg -i "$mov" -c:v libx264 -f mp4 "$mp4"
 done < <(find . -type f -iname '*.mov')


  


  This works technically fine.

  


  As a second step I need to merge two video files : the first one is always the same (intro.mp4 with audio), the second file is the either converted .mov or the .mp4 from the folder (also with audio).
Additionally I need a screenshot of the first frame from the second video, which shall be the very first frame and visible for e.g. half a second (for e.g. youtube-shorts to differentiate the videos).

  


  I create the screenshot with

  


  ffmpeg -i ${fzbVideo} -ss 1 -vframes 1 ${cover}"_%01d.jpg"


  


  which works perfectly fine.

  


  As far as I could I followed the example shown here and the documentation of ffmpeg
and created a loop for all the videos and the steps of merge screenshot and videos :

  


  for fzbVideo in *.mp4; do
    # intro should be at the beginning of each video
    intro="intro/fzb-intro.mp4"
    # getting a cover imge
    cover="$(basename ${fzbVideo} .mp4)_cover"
    # naming the output file
    fzbVideoOutput="$(basename ${fzbVideo} .mp4)_output.mp4"
    #   create a cover image from the first frame of the video
    ffmpeg -i ${fzbVideo} -ss 1 -vframes 1 ${cover}"_%01d.jpg"
    # combine the cover image with the intro and the actual video file
    ffmpeg \
-loop 1 -framerate 1 -t 1 -i ${cover}"_1.jpg" \
-i ${intro} \
-i ${fzbVideo} \
-f lavfi -t 0.1 -i anullsrc=channel_layout=stereo:sample_rate=44100 \
-filter_complex '[0:v:0][0:a:0][1:v:0][1:a:0][2:a:0][2:a:0]concat=n=3:v=1:a=1' ${fzbVideoOutput}
done


  


  But this creates the error :

  


  Stream specifier ':a:0' in filtergraph description [0:v:0][0:a:0][1:v:0][1:a:0][2:a:0][2:a:0]concat=n=3:v=1:a=1 matches no streams.


  


  What do I need to change ?
Additionally, is there a way to combine the converstion from .mov to .mp4 also in the loop (if necessary) ?

  


  ---

  


  Edit : content from the CLI, in case this is important information :

  


  ffmpeg version 6.0 Copyright (c) 2000-2023 the FFmpeg developers
  built with Apple clang version 14.0.3 (clang-1403.0.22.14.1)
  configuration: --prefix=/opt/homebrew/Cellar/ffmpeg/6.0_1 --enable-shared --enable-pthreads --enable-version3 --cc=clang --host-cflags= --host-ldflags= --enable-ffplay --enable-gnutls --enable-gpl --enable-libaom --enable-libaribb24 --enable-libbluray --enable-libdav1d --enable-libmp3lame --enable-libopus --enable-librav1e --enable-librist --enable-librubberband --enable-libsnappy --enable-libsrt --enable-libsvtav1 --enable-libtesseract --enable-libtheora --enable-libvidstab --enable-libvmaf --enable-libvorbis --enable-libvpx --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxml2 --enable-libxvid --enable-lzma --enable-libfontconfig --enable-libfreetype --enable-frei0r --enable-libass --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg --enable-libspeex --enable-libsoxr --enable-libzmq --enable-libzimg --disable-libjack --disable-indev=jack --enable-videotoolbox --enable-audiotoolbox --enable-neon
  libavutil      58.  2.100 / 58.  2.100
  libavcodec     60.  3.100 / 60.  3.100
  libavformat    60.  3.100 / 60.  3.100
  libavdevice    60.  1.100 / 60.  1.100
  libavfilter     9.  3.100 /  9.  3.100
  libswscale      7.  1.100 /  7.  1.100
  libswresample   4. 10.100 /  4. 10.100
  libpostproc    57.  1.100 / 57.  1.100
Input #0, image2, from 'IMG_5546_cover_1.jpg':
  Duration: 00:00:01.00, start: 0.000000, bitrate: 836 kb/s
  Stream #0:0: Video: mjpeg (Baseline), yuvj420p(pc, bt470bg/unknown/unknown), 1080x1920, 1 fps, 1 tbr, 1 tbn
Input #1, mov,mp4,m4a,3gp,3g2,mj2, from 'intro/fzb-intro.mp4':
  Metadata:
    major_brand     : mp42
    minor_version   : 1
    compatible_brands: isommp41mp42
    creation_time   : 2023-11-24T21:59:10.000000Z
  Duration: 00:00:00.83, start: 0.000000, bitrate: 1247 kb/s
  Stream #1:0[0x1](und): Video: h264 (High) (avc1 / 0x31637661), yuv420p(tv, bt709, progressive), 602x1070, 1191 kb/s, 30 fps, 30 tbr, 600 tbn (default)
    Metadata:
      creation_time   : 2023-11-24T21:59:10.000000Z
      handler_name    : Core Media Video
      vendor_id       : [0][0][0][0]
  Stream #1:1[0x2](und): Audio: aac (LC) (mp4a / 0x6134706D), 44100 Hz, mono, fltp, 38 kb/s (default)
    Metadata:
      creation_time   : 2023-11-24T21:59:10.000000Z
      handler_name    : Core Media Audio
      vendor_id       : [0][0][0][0]
Input #2, mov,mp4,m4a,3gp,3g2,mj2, from 'IMG_5546.mp4':
  Metadata:
    major_brand     : isom
    minor_version   : 512
    compatible_brands: isomiso2avc1mp41
    encoder         : Lavf60.3.100
  Duration: 00:00:28.37, start: 0.000000, bitrate: 3126 kb/s
  Stream #2:0[0x1](und): Video: h264 (High) (avc1 / 0x31637661), yuv420p(tv, bt709, progressive), 1080x1920, 2989 kb/s, 29.97 fps, 29.97 tbr, 30k tbn (default)
    Metadata:
      handler_name    : Core Media Video
      vendor_id       : [0][0][0][0]
      encoder         : Lavc60.3.100 libx264
  Stream #2:1[0x2](und): Audio: aac (LC) (mp4a / 0x6134706D), 44100 Hz, stereo, fltp, 128 kb/s (default)
    Metadata:
      handler_name    : Core Media Audio
      vendor_id       : [0][0][0][0]
Stream specifier ':a' in filtergraph description [0:v] [0:a] [1:v] [1:a] [2:v] [2:a] concat=n=3:v=1:a=1 [v] [a] matches no streams.


  


• Revision 4bd171152d : Refactor 8x8 fwd transform unit test This commit reworked the unit test for 8x8

  17 septembre 2013, par Jingning Han

  Changed Paths :
   Modify /test/dct16x16_test.cc

  
   Modify /test/fdct8x8_test.cc

  
  
  Refactor 8x8 fwd transform unit test

  This commit reworked the unit test for 8x8 forward transform. It
  allows scalability to cover various implemented versions.

  Change-Id : I5594bd3e2307bb5bec764eaffd8860caa260e432

• Revision 806fa6aaca : Silience -wextra warnings in vp9_reconintra.c The warning messages complained t

  13 mai 2014, par Jingning Han

  Changed Paths :
   Modify /vp9/common/vp9_reconintra.c

  
  
  Silience -wextra warnings in vp9_reconintra.c

  The warning messages complained that there are unused arguments
  in a few prediction modes. This structure was designed on purpose,
  such that a wrapper function can cover all prediction mode cases
  and make them readily accessible as an pointer array.

  This commit silences such warnings.

  Change-Id : I7036b6bdb70747e5327d8f6fceb154f100abc4c0