I found three commands that helped me reduce the delay of live streams. The first command its very basic and straight forward, the second one it’s been combined with other options which might work differently on each environment and the last command it is a hacky version that I found in the documentation It was … Read more
You can use ffmpeg to convert to WebM. Make sure to compile it with the –enable-libvpx and –enable-libvorbis flags (see FFmpeg compile guides), or visit the FFmpeg Download page for links to builds that include support. After that, you can use the following command (I’m using input.flv as my example input file): ffmpeg -i input.flv … Read more
Assuming you want to concatenate the movie, you can use the following command: ffmpeg -f concat -i inputs.txt -vcodec copy -acodec copy Mux1.mp4 With the following text in inputs.txt: file 75_540_38HQ2.mp4 file 76_70_20.mp4 file 76_173_80.mp4 file 81_186_35.mp4 Note: some distributions (like Ubuntu) do not have ffmpeg in their repository and instead define ffmpeg to be … Read more
Use the mpdecimate filter, whose purpose is to “Drop frames that do not differ greatly from the previous frame in order to reduce frame rate.” This will generate a console readout showing which frames the filter thinks are duplicates. ffmpeg -i input.mp4 -vf mpdecimate -loglevel debug -f null – To generate a video with the … Read more
anullsrc audio filter You can use ffmpeg to create the silent audio and combine it with a video in one step. This example will use the anullsrc audio filter to generate stereo silent audio with a sample rate of 44100: ffmpeg -f lavfi -i anullsrc=channel_layout=stereo:sample_rate=44100 -i video.mov -c:v copy -c:a aac -shortest output.mov channel_layout=stereo:sample_rate=44100 is … Read more
-vf “scale=640:-1” works great until you will encounter error [libx264 @ 0x2f08120] height not divisible by 2 (640×853) So most generic approach is use filter expressions: scale=640:trunc(ow/a/2)*2 It takes output width (ow), divides it by aspect ratio (a), divides by 2, truncates digits after decimal point and multiplies by 2. It guarantees that resulting height … Read more
Use the vstack (vertical), hstack (horizontal), or xstack (custom layout) filters. It is easier and faster than other methods. Combine/stack two videos or images Vertical Using the vstack filter. ffmpeg -i input0 -i input1 -filter_complex vstack=inputs=2 output Videos must have the same width. Horizontal Using the hstack filter. ffmpeg -i input0 -i input1 -filter_complex hstack=inputs=2 … Read more
I’ve been playing around with this for a few days. That “ffmpegprogress” thing helped, but it was very hard to get to work with my set up, and hard to read the code. In order to show the progress of ffmpeg you need to do the following: run the ffmpeg command from php without it … Read more
Actually it is not enough to add -strict -2 to the command line. It is very important where the -strict -2 is added and unfortunately this is not explained in the error message. It should be just before the last argument, that is, as follows: ffmpeg -i infile -strict -2 outfile
Official ffmpeg documentation on this: Create a thumbnail image every X seconds of the video Output one image every second: ffmpeg -i input.mp4 -vf fps=1 out%d.png Output one image every minute: ffmpeg -i test.mp4 -vf fps=1/60 thumb%04d.png Output one image every 10 minutes: ffmpeg -i test.mp4 -vf fps=1/600 thumb%04d.png