We do this for all the videos that were sent, and the compile a list of Lets convert the videos to a common video/audio format: ffmpeg -y -i video_from_some_phone.mp4 $(CODECS) \ With fade out at 45 seconds for five seconds! ffmpeg -y -i slide_show_vid.mp4 -i my_sound_file.mp3 \ Lets add some sound by merging slide_show_vid.mp4 and my_sound_file.mp3 This then produces a file named slide_show_vid.mp4, without any sound. Reduced the list greatly, but this example shows two different imagesĪnd durations in the file: file plain_picture.jpg This tells ffmpeg to use a filter named concat against the list. If you notice in the above command we use concat and image_list.txt. Now we need to make the image collage, we can do that with theįollowing: ffmpeg -y -f concat -i image_list.txt $(REFORMAT) $(CODECS) slide_show_vid.mp4
We need to use a common codec, and audio we do this with the following: CODECS=-s $(RES) -r $(RATE) -acodec aac -vcodec libx264 -ar 48000 -strict experimental
The above will use the resolution values and set padding so that the Lets make this part of the ffmpeg invocation: REFORMAT=-vf 'scale=$(RESX):$(RESY):force_original_aspect_ratio=decrease,pad=$(RESX):$(RESY):(ow-iw)/2:(oh-ih)/2,setsar=0' This works well for several reasons, one of those is that the variousĮlements could be defined through variables at the top in a simple way.įirstly I needed to specify the resolution, note that a lower proportionįirstly, all videos pieces need to be in a fixed sized and orientation, Start as I meant to go on and would compile all this with a Makefile. Since much of the video wasn't going to work on first go, I decided to Photos needed music and differing amounts of time on screen. Videos of different rotations sizes and the same went for photos. The brief was this: "Can you merge all these videos and pictures into one with someĮssentially this is a collage of random sized videos, orientations andĪfter trying a few programs I decided to settle with ffmpeg. To shrink the video frame size to 1/3 the original size, but simply copyĪudio: $ ffmpeg -i source_file.mp4 -vf "scale=iw/3:ih/3" -c:a copy output.mp4 Video $ ffmpeg -i source_file.mkv -acodec copy -vcodec copy dest_file.mp4 Rebuilding mp4 from m3u8: $ ffmpeg -i 'index_728_av-p.m3u8' -bsf:a aac_adtstoasc -vcodec copy -c copy -crf 50 file.mp4 $ for i in $( grep 'Chapter #' /tmp/chapters | sed -e 's/.*#//g' -e 's/.
$ ffmpeg -i 'unabridged.mp4' -f ffmetadata 2> /tmp/chapters Turning a mp4 audio file with chapters into individual mp3 files perĬhapter. Remove audio from video file: $ ffmpeg -i video.3gp -vcodec copy -an newvideo.3gpĬonverting formats $ ffmpeg -i video.mkv -acodec copy -vcodec copy video.mp4 audioĬonvert mp4 audio to wav $ ffmpeg -i input.mp4 -vn -acodec pcm_s16le -ar 44100 -ac 2 output.wav how do i make caption text move around during the movie?.ok, how do i play a stupid video for conference calls?.
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