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 http://localhost:8090/webcam.ffm
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 'http://localhost:8090/webcam.ffm':
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=0.501x
as 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)
