User:Joger/FFmpeg: Difference between revisions
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== FFProbe == | == FFProbe == | ||
FFProbe is used to inspect media, for example to view format or stream information. | FFProbe is used to inspect media, for example to view format or stream information. You can use the following command line to view a file's format and stream information. It will print out information about the file's streams, such as video and audio streams, as well as the container format. | ||
ffprobe -v error -show_streams -show_format -print_format json <name_of_media> | ffprobe -v error -show_streams -show_format -print_format json <name_of_media> | ||
Useful options | Useful options | ||
* | *<tt>-v error</tt> suppresses FFprobe's header and decoding information, so we only see the interesting output information. | ||
* | *<tt>-print_format json</tt> argument makes the output easier to read. | ||
* | *<tt>-select_streams v</tt> argument will only print video streams. It can be replaced by <tt>a</tt> to show only ''''a'''udio' streams, or s to show only ''''s'''ubtitle' streams. | ||
== FFMpeg == | ==FFMpeg == | ||
Low latency streaming | Low latency streaming | ||
> mediamtx | > mediamtx | ||
> ffmpeg -filter_complex ddagrab=video_size=1024x890:output_idx=0:framerate=60,hwdownload,format=bgra -fflags nobuffer -vcodec libx264 -tune zerolatency -f rtsp rtsp://127.0.0.1:8554/webcam.h264 | > ffmpeg -filter_complex ddagrab=video_size=1024x890:output_idx=0:framerate=60,hwdownload,format=bgra -fflags nobuffer -vcodec libx264 -tune zerolatency -f rtsp rtsp://127.0.0.1:8554/webcam.h264 | ||
> ffplay rtsp://127.0.0.1:8554/webcam.h264 -fflags nobuffer -flags low_delay -framedrop | > ffplay rtsp://127.0.0.1:8554/webcam.h264 -fflags nobuffer -flags low_delay -framedrop | ||
Revision as of 10:45, 25 August 2024
FFProbe
FFProbe is used to inspect media, for example to view format or stream information. You can use the following command line to view a file's format and stream information. It will print out information about the file's streams, such as video and audio streams, as well as the container format.
ffprobe -v error -show_streams -show_format -print_format json <name_of_media>
Useful options
- -v error suppresses FFprobe's header and decoding information, so we only see the interesting output information.
- -print_format json argument makes the output easier to read.
- -select_streams v argument will only print video streams. It can be replaced by a to show only 'audio' streams, or s to show only 'subtitle' streams.
FFMpeg
Low latency streaming
> mediamtx > ffmpeg -filter_complex ddagrab=video_size=1024x890:output_idx=0:framerate=60,hwdownload,format=bgra -fflags nobuffer -vcodec libx264 -tune zerolatency -f rtsp rtsp://127.0.0.1:8554/webcam.h264 > ffplay rtsp://127.0.0.1:8554/webcam.h264 -fflags nobuffer -flags low_delay -framedrop