BIG docs refactoring

2026-04-22 23:57:20 +08:00 · 2026-02-06 20:43:50 +03:00
parent 5bf5327a45
commit d01b99d105
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+## FFplay output
+
+[FFplay](https://stackoverflow.com/questions/27778678/what-are-mv-fd-aq-vq-sq-and-f-in-a-video-stream) `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/video
+- `A-V` - av_diff, difference between audio and video timestamps
+- `fd` - frames dropped
+- `aq` - audio queue (0 - no delay)
+- `vq` - video queue (0 - no delay)
+- `sq` - subtitle queue
+- `f` - 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
+
+```yaml
+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](https://superuser.com/questions/1290996/non-monotonous-dts-with-igndts-flag)