Opened 9 years ago
#4709 new enhancement
Support mjpeg 4:2:2 encoding in rows of one block instead of two blocks
Reported by: | Carl Eugen Hoyos | Owned by: | |
---|---|---|---|
Priority: | wish | Component: | avcodec |
Version: | git-master | Keywords: | mjpeg rtp |
Cc: | Blocked By: | ||
Blocking: | Reproduced by developer: | no | |
Analyzed by developer: | no |
Description
Sending FFmpeg-encoded 4:2:2 mjpeg is currently impossible because vsample[] is 2,2,2. RFC 2435 requires 4:2:2 mjpeg over rtp to be encoded with vsample[] 1,1,1.
$ ffmpeg -i fate-suite/lena.pnm -vcodec mjpeg -pix_fmt yuvj422p -f rtp rtp://127.0.0.1:5004 ffmpeg version N-73450-ge83ffb4 Copyright (c) 2000-2015 the FFmpeg developers built with gcc 4.7 (SUSE Linux) configuration: --enable-gpl libavutil 54. 28.100 / 54. 28.100 libavcodec 56. 46.101 / 56. 46.101 libavformat 56. 40.100 / 56. 40.100 libavdevice 56. 4.100 / 56. 4.100 libavfilter 5. 20.100 / 5. 20.100 libswscale 3. 1.101 / 3. 1.101 libswresample 1. 2.100 / 1. 2.100 libpostproc 53. 3.100 / 53. 3.100 Input #0, image2, from 'fate-suite/lena.pnm': Duration: 00:00:00.04, start: 0.000000, bitrate: 39333 kb/s Stream #0:0: Video: ppm, rgb24, 256x256, 25 tbr, 25 tbn, 25 tbc [swscaler @ 0x2636220] deprecated pixel format used, make sure you did set range correctly Output #0, rtp, to 'rtp://127.0.0.1:5004': Metadata: encoder : Lavf56.40.100 Stream #0:0: Video: mjpeg, yuvj422p(pc), 256x256, q=2-31, 200 kb/s, 25 fps, 90k tbn, 25 tbc Metadata: encoder : Lavc56.46.101 mjpeg Stream mapping: Stream #0:0 -> #0:0 (ppm (native) -> mjpeg (native)) SDP: v=0 o=- 0 0 IN IP4 127.0.0.1 s=No Name c=IN IP4 127.0.0.1 t=0 0 a=tool:libavformat 56.40.100 m=video 5004 RTP/AVP 26 b=AS:200 Press [q] to stop, [?] for help [rtp @ 0x2641ce0] Only 1x1 chroma blocks are supported. Aborted! frame= 1 fps=0.0 q=4.1 Lsize= 0kB time=00:00:00.04 bitrate= 5.6kbits/s video:14kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: unknown
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