You’ll need to reencode. Set x264’s keyint parameter to 5*fps and disable scenecut. If your fps is 24 for example : ffmpeg -i <input> -vcodec libx264 -x264-params keyint=120:scenecut=0 -acodec copy out.mp4 This is obviously not optimal for quality but it’ll match your demand. Edited to change no-scenecut to scenecut=0, as per sigh-boy suggestion.
In this specific case for capturing ffmpeg’s status output (which goes to STDERR), this SO question solved it for me: FFMPEG and Pythons subprocess The trick is to add universal_newlines=True to the subprocess.Popen() call, because ffmpeg’s output is in fact unbuffered but comes with newline-characters. cmd = “ffmpeg -i in.mp4 -y out.avi” process = subprocess.Popen(cmd, … Read more
ffmpeg has a special pipe flag that instructs the program to consume stdin. note that almost always the input format needs to be defined explicitly. example (output is in PCM signed 16-bit little-endian format): cat file.mp3 | ffmpeg -f mp3 -i pipe: -c:a pcm_s16le -f s16le pipe: pipe docs are here supported audio types are … Read more
This will print the video FPS: ffprobe -v error -select_streams v -of default=noprint_wrappers=1:nokey=1 -show_entries stream=r_frame_rate file.mp4
The correct way to concat multiple video files from m3u8 playlist is ffmpeg -i “http://example.com/chunklist.m3u8” -codec copy file.mp4 the m3u8 playlist can be on web or locally in directory it contains list of file paths relative to the playlist -codec copy to avoid encoding (which takes time) container type matters: *.mp4 is fine but it … Read more
It looks like the options have changed slightly in recent versions. To use the filter input sources, you have to: Set the input format to the libavfilter virtual device using: -f lavfi Set the filter input source using the -i flag (not -vf) Provide arguments as complete key-value pairs, like: color=color=red This works for ffplay, … Read more
The way I’m doing it is to implement an AVCaptureSession, which has a delegate with a callback that’s run on every frame. That callback sends each frame over the network to the server, which has a custom setup to receive it. Here’s the flow: http://developer.apple.com/library/ios/#documentation/AudioVideo/Conceptual/AVFoundationPG/Articles/03_MediaCapture.html#//apple_ref/doc/uid/TP40010188-CH5-SW2 And here’s some code: // make input device NSError *deviceError; … Read more
Here is a blog entry, or tutorial if you will, that achieves something very similar. Their setup slightly different, but this is the summary: use ffmpeg to convert your input into mpeg1video: ffmpeg -i rtsp://whatever -f mpeg1video -b 800k -r 30 http://localhost:8082/yourpassword/640/480/ Install node.js with stream-server.js script from jsmpeg and ws ws WebSocket package. To … Read more
Yes you can, you just have to specific the pixel format. To get the whole list of the format: ffmpeg -pix_fmts | grep -i pixel_format_name For example if you want to save the 1st video track of an mp4 file as a yuv420p (p means planar) file: ffmpeg -i video.mp4 -c:v rawvideo -pix_fmt yuv420p out.yuv