Invalid FPS with dshow usb camera

[LazyCuteLion]

when play with camera, i choose the menu-item[MJPG,1920x1080,30FPS],but actually play with [YUY2,1920x1080,5FPS].

[LazyCuteLion]

check the log,it seems to be ffmpeg? Flyleaf Log: 16.30.18.214 | Debug | [#1] [Demuxer: Main] Opening -> Stopped 16.30.18.226 | Debug | [#1] [Decoder: Video] Stopped -> Opening 16.30.18.238 | Info | [#1] [Decoder: Video] VA AV_CODEC_IDMJPEG not supported 16.30.18.246 | Info | [#1] [Demuxer: Main] [Video #0] Enabled 16.30.18.251 | Debug | [#1] [Decoder: Video] Opening -> Stopped 16.30.18.261 | Info | [#1] [DecoderContext] [OpenVideoStream] # => #0 16.30.18.282 | Info | [#1] [DecoderContext] [OpenPlaylistItem] None => 16.30.18.288 | Info | [#1] [DecoderContext] [Open] fmt://dshow?video=USB Camera&video_size=1920x1080&framerate=30&vcodec=mjpeg 16.30.18.311 | Debug | [#1] [Player ] OnBufferingStarted 16.30.18.319 | Debug | [#1] [Demuxer: Main] Stopped -> Running 16.30.18.325 | Debug | [#1] [Decoder: Video] Stopped -> Running 16.30.18.340 | Debug | [#1] [Demuxer: Main] Thread started (Running) 16.30.18.349 | Debug | [#1] [Decoder: Video] Thread started (Running) 16.30.18.383 | Debug | [#1] [Renderer ] Preparing planes for yuvj422p with Flyleaf 16.30.18.410 | Debug | [#1] [Renderer ] Prepared planes for yuvj422p with Flyleaf [YUVPlanar] 16.30.18.730 | Info | [#1] [Player ] Started [V: 00:00:00.0333337] 16.30.18.735 | Debug | [#1] [Player ] OnBufferingCompleted

FFmpeg Log: FFmpeg|Debug |[mjpeg @ 0000021f04955e40] marker=d8 avail_size_in_buf=280550 FFmpeg|Debug |[mjpeg @ 0000021f04955e40] marker parser used 0 bytes (0 bits) FFmpeg|Debug |[mjpeg @ 0000021f04955e40] marker=db avail_size_in_buf=280548 FFmpeg|Debug |[mjpeg @ 0000021f04955e40] index=0 FFmpeg|Debug |[mjpeg @ 0000021f04955e40] qscale[0]: 1 FFmpeg|Debug |[mjpeg @ 0000021f04955e40] marker parser used 67 bytes (536 bits) FFmpeg|Debug |[mjpeg @ 0000021f04955e40] marker=db avail_size_in_buf=280479 FFmpeg|Debug |[mjpeg @ 0000021f04955e40] index=1 FFmpeg|Debug |[mjpeg @ 0000021f04955e40] qscale[1]: 2 FFmpeg|Debug |[mjpeg @ 0000021f04955e40] marker parser used 67 bytes (536 bits) FFmpeg|Debug |[mjpeg @ 0000021f04955e40] marker=c0 avail_size_in_buf=280410 FFmpeg|Debug |[mjpeg @ 0000021f04955e40] Changing bps from 0 to 8 FFmpeg|Debug |[mjpeg @ 0000021f04955e40] sof0: picture: 1920x1080 FFmpeg|Debug |[mjpeg @ 0000021f04955e40] component 0 2:1 id: 0 quant:0 FFmpeg|Debug |[mjpeg @ 0000021f04955e40] component 1 1:1 id: 1 quant:1 FFmpeg|Debug |[mjpeg @ 0000021f04955e40] component 2 1:1 id: 2 quant:1 FFmpeg|Debug |[mjpeg @ 0000021f04955e40] pix fmt id 21111100 FFmpeg|Debug |[mjpeg @ 0000021f04955e40] Format yuvj422p chosen by get_format(). FFmpeg|Debug |[mjpeg @ 0000021f04955e40] marker parser used 17 bytes (136 bits) FFmpeg|Debug |[mjpeg @ 0000021f04955e40] marker=c4 avail_size_in_buf=280391 FFmpeg|Debug |[mjpeg @ 0000021f04955e40] marker parser used 0 bytes (0 bits) FFmpeg|Debug |[mjpeg @ 0000021f04955e40] marker=c4 avail_size_in_buf=280358 FFmpeg|Debug |[mjpeg @ 0000021f04955e40] marker parser used 0 bytes (0 bits) FFmpeg|Debug |[mjpeg @ 0000021f04955e40] marker=c4 avail_size_in_buf=280175 FFmpeg|Debug |[mjpeg @ 0000021f04955e40] marker parser used 0 bytes (0 bits) FFmpeg|Debug |[mjpeg @ 0000021f04955e40] marker=c4 avail_size_in_buf=280142 FFmpeg|Debug |[mjpeg @ 0000021f04955e40] marker parser used 0 bytes (0 bits) FFmpeg|Debug |[mjpeg @ 0000021f04955e40] marker=dd avail_size_in_buf=279959 FFmpeg|Debug |[mjpeg @ 0000021f04955e40] marker parser used 0 bytes (0 bits) FFmpeg|Debug |[mjpeg @ 0000021f04955e40] escaping removed 590 bytes FFmpeg|Debug |[mjpeg @ 0000021f04955e40] marker=da avail_size_in_buf=279953 FFmpeg|Debug |[mjpeg @ 0000021f04955e40] marker parser used 279363 bytes (2234904 bits) FFmpeg|Debug |[mjpeg @ 0000021f04955e40] marker=d9 avail_size_in_buf=0 FFmpeg|Debug |[mjpeg @ 0000021f04955e40] decode frame unused 0 bytes FFmpeg|Debug |[dshow @ 0000021f049513c0] All info found

[SuRGeoNix]

Hi @LazyCuteLion, flyleaf sets the proper ffmpeg parameters so I guess is an issue with FFmpeg? Can you try ffmpeg itself?

[LazyCuteLion]

ffmpeg can not play , i tested by ffplay,it is ok. en,i think it is because of ffmpeg.

[LazyCuteLion]

if use ffmpeg to record a video (command:ffmpeg -f dshow -video_size 1920x1080 -framerate 30 -vcodec mjpeg -i video="USB Camera" "D:\xxxx.mp4") it is ok. so,what is wrong?

[SuRGeoNix]

There is no point to test the FFmpeg if you transcode it to mp4 for example. Did you say that ffplay works or not? Possible try mpv as well?

[LazyCuteLion]

ffplay work, the command:-f dshow -video_size 1920x1080 -framerate 30 -vcodec mjpeg -i video="USB Camera" mpv,i try it, only play "av://dshow:video=USB Camera", when i add the parameters it doesn't work.(av://dshow:video=USB Camera:width=1920:height=1080:fps=30,I'm not familiar with mpv,can you give me the right url?)

[SuRGeoNix]

I can't think how Flyleaf will change the framerate itself. So something is wrong with ffmpeg and framerate parameter in your case. Wondering if FFmpeg version 5/6 have both the same issue. I will need to test it with a camera and reproduce it myself but to be honest, nobody complained for such an issue so far. Might something specific with your case.

A trace log would help (both for flyleaf and ffmpeg)

[LazyCuteLion]

check the log(disable HW): 10.07.47.437 | Info | [#1] [Player ] Opening fmt://dshow?video=USB Camera&video_size=1920x1080&framerate=30&vcodec=mjpeg 10.07.47.444 | Debug | [#1] [Player ] Initializing 10.07.47.469 | Debug | [#1] [Player ] Initialized 10.07.47.503 | Info | [#1] [PluginHandler ] [OpenDefault] Open Success 10.07.47.510 | Info | [#1] [PluginHandler ] SuggestItem #0 - 10.07.47.525 | Info | [#1] [PluginHandler ] [OpenDefault] Open Item (0) Success 10.07.47.553 | Debug | [#1] [Demuxer: Main] Stopped -> Opening 10.07.47.726 | Debug | [#1] [Demuxer: Main] Ignoring format option reconnect 10.07.47.730 | Debug | [#1] [Demuxer: Main] Ignoring format option reconnect_streamed 10.07.47.733 | Debug | [#1] [Demuxer: Main] Ignoring format option reconnect_delay_max 10.07.47.736 | Debug | [#1] [Demuxer: Main] Ignoring format option user_agent 10.07.47.740 | Debug | [#1] [Demuxer: Main] Ignoring format option http_persistent 10.07.47.744 | Debug | [#1] [Demuxer: Main] Ignoring format option rtsp_transport 10.07.47.747 | Debug | [#1] [Demuxer: Main] Ignoring format option vcodec 10.07.48.100 | Info | [#1] [Demuxer: Main] Format Context Info [Format ] DirectShow capture/dshow | | 45.17:50:43.3893680/00:00:00 | 45.17:50:43.3893680/00:00:00 [Video #0] mjpeg yuvj422p 1920x1080 @ 30 | [Color: BT601] [BR: 0] | 45.17:50:43.3893684/-10675199.02:48:05.4775808 | 45.17:50:43.3893684/00:00:00

last line is same to ffmpeg itself ( Stream #0:0: Video: mjpeg (Baseline) (MJPG / 0x47504A4D), yuvj422p(pc, bt470bg/bt709/unknown), 1920x1080, 30 fps, 30 tbr, 10000k tbn). maybe ,it is Flyeaf can not be handled correctly the pixel format of yuvj422p? Anyway, it's not really important. should we close this issues?

[LazyCuteLion]

Besides, you don't seem to have noticed of [#498]? I'd rather you answered there than here.

[SuRGeoNix]

I don't think this is an issue with Pixel Format. I think is an issue with timestamps, that's why I asked you for flyleaf's trace log. It's an issue so let it be open and might review this in the future (will try to reproduce it).