I have premium webcam from Logitech (C930e) and this camera support mjpeg built in processing directly in the camera it self. My purpose is to get that stream with ffmpeg and pipe it to ffserver so its can be streamed to web browser in mjpeg format. The problem is although my webcam already producing mjpeg but the ffmpeg or ffserver is still do a transcoding. So its useless process eating all my CPU.
This is my ffserver configuration
HTTPPort 8090 HTTPBindAddress 0.0.0.0 MaxClients 20 MaxBandwidth 500000 NoDaemon <Feed webcam.ffm> file /tmp/webcam.ffm FileMaxSize 10M </Feed> <Stream webcam.mjpeg> NoDefaults Feed webcam.ffm Format mpjpeg VideoSize 640x360 VideoFrameRate 30 VideoBitRate 10280 VideoQMin 1 VideoQMax 1 NoAudio </Stream> <Stream index.html> Format status </Stream>This is my ffmpeg output:
sudo ~/bin/ffmpeg -v verbose -r 30 -s 640x360 -f v4l2 -input_format mjpeg -i /dev/video0 -c:v copy ffmpeg version N-78619-g778439b Copyright (c) 2000-2016 the FFmpeg developers built with gcc 4.9.2 (Raspbian 4.9.2-10) configuration: --prefix=/home/pi/ffmpeg_build --pkg-config-flags=--static --extra-cflags=-I/home/pi/ffmpeg_build/include --extra-ldflags=-L/home/pi/ffmpeg_build/lib --bindir=/home/pi/bin --enable-gpl --enable-libass --enable-libfdk-aac --enable-libfreetype --enable-libmp3lame --enable-libopus --enable-libtheora --enable-libvorbis --enable-libvpx --enable-libx264 --enable-nonfree libavutil 55. 18.100 / 55. 18.100 libavcodec 57. 24.105 / 57. 24.105 libavformat 57. 26.100 / 57. 26.100 libavdevice 57. 0.101 / 57. 0.101 libavfilter 6. 34.100 / 6. 34.100 libswscale 4. 0.100 / 4. 0.100 libswresample 2. 0.101 / 2. 0.101 libpostproc 54. 0.100 / 54. 0.100 [video4linux2,v4l2 @ 0x231a290] fd:3 capabilities:84200001 [mjpeg @ 0x231ae10] Changing bps to 8 [mjpeg @ 0x231ae10] EOI missing, emulating Input #0, video4linux2,v4l2, from '/dev/video0': Duration: N/A, start: 5997.091177, bitrate: N/A Stream #0:0: Video: mjpeg, 1 reference frame, yuvj422p(pc, bt470bg/unknown/unknown), 640x360, -5 kb/s, 30 fps, 30 tbr, 1000k tbn, 1000k tbc [tcp @ 0x231f7a0] Connection to tcp://localhost:8090 failed (Connection refused), trying next address [tcp @ 0x2325f20] Connection to tcp://localhost:8090 failed (Connection refused), trying next address [graph 0 input from stream 0:0 @ 0x231def0] w:640 h:360 pixfmt:yuvj422p tb:1/30 fr:30/1 sar:0/1 sws_param:flags=2 [scaler for output stream 0:0 @ 0x231e1f0] w:640 h:360 flags:'bicubic' interl:0 [graph 0 input from stream 0:0 @ 0x231def0] TB:0.033333 FRAME_RATE:30.000000 SAMPLE_RATE:nan [scaler for output stream 0:0 @ 0x231e1f0] w:640 h:360 fmt:yuvj422p sar:0/1 -> w:640 h:360 fmt:yuvj422p sar:0/1 flags:0x4 Output #0, ffm, to ' Metadata: creation_time : 2016-02-23 01:32:00 encoder : Lavf57.26.100 Stream #0:0: Video: mjpeg, 1 reference frame, yuvj422p(pc), 640x360, q=1-1, 10280 kb/s, 30 fps, 1000k tbn, 30 tbc Metadata: encoder : Lavc57.24.105 mjpeg Side data: cpb: bitrate max/min/avg: 0/0/10280000 buffer size: 0 vbv_delay: -1 Stream mapping: Stream #0:0 -> #0:0 (mjpeg (native) -> mjpeg (native)) Press [q] to stop, [?] for help [mjpeg @ 0x231b750] overread 3 [mjpeg @ 0x231b750] EOI missing, emulating frame= 4000 fps= 15 q=24.8 size= 228156kB time=00:02:13.33 bitrate=14017.9kbits/s speed=0.501xas you can see
Stream #0:0 -> #0:0 (mjpeg (native) -> mjpeg (native))
instead it should be
Stream #0:0 -> #0:0 (copy)
I can not figure out, what causing ffmpeg to ignore the -c:v copy flag... is it because ffserver forced it to transcode no matter it is already in the same format? Or i have something wrong with my command?
Please help... :) I need to stream my mjpeg webcam to the web without re-transcoding, because i purchase that camera is to help my Raspberry Pi 2 (removing the need to do the transcoding in the Pi)
1 Answer
I haven't tried this but it seems like what you were looking for.
From :
An empty stream specifier matches all streams. For example,
-codec copyor-codec: copywould copy all the streams without reencoding.
