FFmpeg C API documentation/tutorial [closed]
I’ve been keeping the Dranger ffmpeg tutorials up to date here: https://github.com/mpenkov/ffmpeg-tutorial I’ve tried to keep the code changes minimal while fixing bugs and rewriting deprecated parts.
ffmpeg
How can I extract a good quality JPEG image from a video file with ffmpeg?
Use -qscale:v to control quality Use -qscale:v (or the alias -q:v) as an output option. Normal range for JPEG is 2-31 with 31 being the worst quality. The scale is linear with double the qscale being roughly half the bitrate. Recommend trying values of 2-5. You can use a value of 1 but you must … Read more
ffprobe or avprobe not found. Please install one
Make sure you have the last version for youtube-dl sudo youtube-dl -U after that you can solve this problem by installing the missing ffmpeg on ubuntu and debian: sudo apt-get install ffmpeg and macOS use the command: brew install ffmpeg
OCI runtime exec failed: exec failed: (…) executable file not found in $PATH”: unknown
This happened to me on windows. Any of these commands will work On Windows CMD (not switching to bash): docker exec -it <container-id> /bin/sh On Windows CMD (after switching to bash): docker exec -it <container-id> //bin//sh or winpty docker exec -it <container-id> //bin//sh On Git Bash: winpty docker exec -it <container-id> //bin//sh For Windows users, … Read more
What does ‘Past duration X.XXX too large’ mean?
One of the maintainers for the DVDStyler project on SourceForge said this about it: FFMpeg versions after Jan 15 2015 often display this warning. It has been added to warn about possible rate control distortion, otherwise it does not cause any harm.
Fetch frame count with ffmpeg
ffprobe ffprobe -v error -select_streams v:0 -count_packets \ -show_entries stream=nb_read_packets -of csv=p=0 input.mp4 This actually counts packets instead of frames but it is much faster. Result should be the same. If you want to verify by counting frames change -count_packets to -count_frames and nb_read_packets to nb_read_frames. What the ffprobe options mean -v error This hides … Read more
How to extract 1 screenshot for a video with ffmpeg at a given time?
Use the -ss option: ffmpeg -ss 01:23:45 -i input -frames:v 1 -q:v 2 output.jpg For JPEG output use -q:v to control output quality. Full range is a linear scale of 1-31 where a lower value results in a higher quality. 2-5 is a good range to try. The select filter provides an alternative method for … Read more
What are all codecs and formats supported by FFmpeg?
Codecs proper: ffmpeg -codecs Formats: ffmpeg -formats
ffmpeg – Converting MOV files to MP4 [closed]
The command to just stream it to a new container (mp4) needed by some applications like Adobe Premiere Pro without encoding (fast) is: ffmpeg -i input.mov -qscale 0 output.mp4 Alternative as mentioned in the comments, which re-encodes with best quaility (-qscale 0): ffmpeg -i input.mov -q:v 0 output.mp4
Fastest way to extract frames using ffmpeg?
If the JPEG encoding step is too performance intensive, you could always store the frames uncompressed as BMP images: ffmpeg -i file.mpg -r 1/1 $filename%03d.bmp This also has the advantage of not incurring more quality loss through quantization by transcoding to JPEG. (PNG is also lossless but tends to take much longer than JPEG to … Read more