69 lines
3.3 KiB
Markdown
69 lines
3.3 KiB
Markdown
## FFplay output
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[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`:
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- `7.11` - master clock, is the time from start of the stream/video
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- `A-V` - av_diff, difference between audio and video timestamps
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- `fd` - frames dropped
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- `aq` - audio queue (0 - no delay)
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- `vq` - video queue (0 - no delay)
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- `sq` - subtitle queue
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- `f` - timestamp error correction rate (Not 100% sure)
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`M-V`, `M-A` means video stream only, audio stream only respectively.
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## Devices Windows
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```
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>ffmpeg -hide_banner -f dshow -list_options true -i video="VMware Virtual USB Video Device"
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[dshow @ 0000025695e52900] DirectShow video device options (from video devices)
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[dshow @ 0000025695e52900] Pin "Record" (alternative pin name "0")
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[dshow @ 0000025695e52900] pixel_format=yuyv422 min s=1280x720 fps=1 max s=1280x720 fps=10
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[dshow @ 0000025695e52900] pixel_format=yuyv422 min s=1280x720 fps=1 max s=1280x720 fps=10 (tv, bt470bg/bt709/unknown, topleft)
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[dshow @ 0000025695e52900] pixel_format=nv12 min s=1280x720 fps=1 max s=1280x720 fps=23
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[dshow @ 0000025695e52900] pixel_format=nv12 min s=1280x720 fps=1 max s=1280x720 fps=23 (tv, bt470bg/bt709/unknown, topleft)
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```
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## Devices Mac
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```
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% ./ffmpeg -hide_banner -f avfoundation -list_devices true -i ""
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[AVFoundation indev @ 0x7f8b1f504d80] AVFoundation video devices:
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[AVFoundation indev @ 0x7f8b1f504d80] [0] FaceTime HD Camera
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[AVFoundation indev @ 0x7f8b1f504d80] [1] Capture screen 0
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[AVFoundation indev @ 0x7f8b1f504d80] AVFoundation audio devices:
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[AVFoundation indev @ 0x7f8b1f504d80] [0] Soundflower (2ch)
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[AVFoundation indev @ 0x7f8b1f504d80] [1] Built-in Microphone
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[AVFoundation indev @ 0x7f8b1f504d80] [2] Soundflower (64ch)
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```
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## Devices Linux
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```
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# ffmpeg -hide_banner -f v4l2 -list_formats all -i /dev/video0
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[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
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[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
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```
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## TTS
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```yaml
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streams:
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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
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```
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## Useful links
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- https://superuser.com/questions/564402/explanation-of-x264-tune
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- https://stackoverflow.com/questions/33624016/why-sliced-thread-affect-so-much-on-realtime-encoding-using-ffmpeg-x264
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- https://codec.fandom.com/ru/wiki/X264_-_описание_ключей_кодирования
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- https://html5test.com/
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- https://trac.ffmpeg.org/wiki/Capture/Webcam
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- https://trac.ffmpeg.org/wiki/DirectShow
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- https://stackoverflow.com/questions/53207692/libav-mjpeg-encoding-and-huffman-table
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- https://github.com/tuupola/esp_video/blob/master/README.md
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- https://github.com/leandromoreira/ffmpeg-libav-tutorial
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- https://www.reddit.com/user/VeritablePornocopium/comments/okw130/ffmpeg_with_libfdk_aac_for_windows_x64/
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- https://slhck.info/video/2017/02/24/vbr-settings.html
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- [HomeKit audio samples problem](https://superuser.com/questions/1290996/non-monotonous-dts-with-igndts-flag)
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