README
¶
FFplay output
FFplay 7.11 A-V: 0.003 fd= 1 aq= 21KB vq= 321KB sq= 0B f=0/0
:
7.11
- master clock, is the time from start of the stream/videoA-V
- av_diff, difference between audio and video timestampsfd
- frames droppedaq
- audio queue (0 - no delay)vq
- video queue (0 - no delay)sq
- subtitle queuef
- timestamp error correction rate (Not 100% sure)
M-V
, M-A
means video stream only, audio stream only respectively.
Devices Windows
>ffmpeg -hide_banner -f dshow -list_options true -i video="VMware Virtual USB Video Device"
[dshow @ 0000025695e52900] DirectShow video device options (from video devices)
[dshow @ 0000025695e52900] Pin "Record" (alternative pin name "0")
[dshow @ 0000025695e52900] pixel_format=yuyv422 min s=1280x720 fps=1 max s=1280x720 fps=10
[dshow @ 0000025695e52900] pixel_format=yuyv422 min s=1280x720 fps=1 max s=1280x720 fps=10 (tv, bt470bg/bt709/unknown, topleft)
[dshow @ 0000025695e52900] pixel_format=nv12 min s=1280x720 fps=1 max s=1280x720 fps=23
[dshow @ 0000025695e52900] pixel_format=nv12 min s=1280x720 fps=1 max s=1280x720 fps=23 (tv, bt470bg/bt709/unknown, topleft)
Devices Mac
% ./ffmpeg -hide_banner -f avfoundation -list_devices true -i ""
[AVFoundation indev @ 0x7f8b1f504d80] AVFoundation video devices:
[AVFoundation indev @ 0x7f8b1f504d80] [0] FaceTime HD Camera
[AVFoundation indev @ 0x7f8b1f504d80] [1] Capture screen 0
[AVFoundation indev @ 0x7f8b1f504d80] AVFoundation audio devices:
[AVFoundation indev @ 0x7f8b1f504d80] [0] Soundflower (2ch)
[AVFoundation indev @ 0x7f8b1f504d80] [1] Built-in Microphone
[AVFoundation indev @ 0x7f8b1f504d80] [2] Soundflower (64ch)
Devices Linux
# ffmpeg -hide_banner -f v4l2 -list_formats all -i /dev/video0
[video4linux2,v4l2 @ 0x7f7de7c58bc0] Raw : yuyv422 : YUYV 4:2:2 : 640x480 160x120 176x144 320x176 320x240 352x288 432x240 544x288 640x360 752x416 800x448 800x600 864x480 960x544 960x720 1024x576 1184x656 1280x720 1280x960
[video4linux2,v4l2 @ 0x7f7de7c58bc0] Compressed: mjpeg : Motion-JPEG : 640x480 160x120 176x144 320x176 320x240 352x288 432x240 544x288 640x360 752x416 800x448 800x600 864x480 960x544 960x720 1024x576 1184x656 1280x720 1280x960
TTS
streams:
tts: ffmpeg:#input=-readrate 1 -readrate_initial_burst 0.001 -f lavfi -i "flite=text='1 2 3 4 5 6 7 8 9 0'"#audio=pcma
Useful links
- https://superuser.com/questions/564402/explanation-of-x264-tune
- https://stackoverflow.com/questions/33624016/why-sliced-thread-affect-so-much-on-realtime-encoding-using-ffmpeg-x264
- https://codec.fandom.com/ru/wiki/X264_-_описание_ключей_кодирования
- https://html5test.com/
- https://trac.ffmpeg.org/wiki/Capture/Webcam
- https://trac.ffmpeg.org/wiki/DirectShow
- https://stackoverflow.com/questions/53207692/libav-mjpeg-encoding-and-huffman-table
- https://github.com/tuupola/esp_video/blob/master/README.md
- https://github.com/leandromoreira/ffmpeg-libav-tutorial
- https://www.reddit.com/user/VeritablePornocopium/comments/okw130/ffmpeg_with_libfdk_aac_for_windows_x64/
- https://slhck.info/video/2017/02/24/vbr-settings.html
- HomeKit audio samples problem
Documentation
¶
Index ¶
Constants ¶
This section is empty.
Variables ¶
This section is empty.
Functions ¶
func NewProducer ¶
NewProducer - FFmpeg producer with auto selection video/audio codec based on client capabilities
Types ¶
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