[rtcweb] Giri Mandyam's response / h261 performance (Was: Straw Poll on Video Codec Alternatives)
Hervé W. <H.O.W.aka.V+ietf@gmail.com> Sun, 12 January 2014 11:25 UTC
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From: "Hervé W." <H.O.W.aka.V+ietf@gmail.com>
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Subject: [rtcweb] Giri Mandyam's response / h261 performance (Was: Straw Poll on Video Codec Alternatives)
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On 12 January 2014 06:00, Mandyam, Giridhar wrote: > 6. All entities MUST support H.261 > > a. Are you in favor of this option [Yes/No/Acceptable]: NO > > b. Do you have any objections to this option, if so please summarize them: > > Section 7 of > https://datatracker.ietf.org/doc/draft-burman-rtcweb-h264-proposal/ provides > performance data for H.264. I do not believe that H.261 would provide > equivalent or superior performance under identical testing conditions, and > no data has been provided to the IETF or on the mailing lists proving > otherwise. This option would allow a presumably inferior codec (H.261) to > be the fallback option. Moreover, this does not allow interop with legacy > systems and standards such as 3GPP IMS Video Telephony. Here's some performance data time ./x264-r2377-1ca7bb9.exe sign_irene_cif.y4m --profile baseline -o irene-unspec.264 encoded 540 frames, 37.73 fps, 362.40 kb/s real 0m14.501s time ffmpeg -i sign_irene_cif.y4m -g 100 irene-unspec.h261 real 0m2.118s time ./x264-r2377-1ca7bb9.exe sign_irene_cif.y4m --profile baseline --preset ultrafast -o irene-unspec.cbp.ultrafast.264 encoded 540 frames, 238.31 fps, 871.36 kb/s real 0m2.449s time ffmpeg -i sign_irene_cif.y4m -g 100 -b:v 362571 irene-362571.h261 real 0m2.307s time ./x264-r2377-1ca7bb9.exe sign_irene_cif.y4m --profile baseline --preset ultrafast --bitrate 363 -o irene-363k.cbp.ultrafast.264 encoded 540 frames, 247.03 fps, 362.39 kb/s real 0m2.344s 956K irene-unspec.264 2.3M irene-unspec.cbp.ultrafast.264 956K irene-363k.cbp.ultrafast.264 595K irene-unspec.h261 1023K irene-362571.h261 ffmpeg -i irene-unspec.264 -f yuv4mpegpipe -v -1 - | ./daala/daala-HEAD-b2fa2c0/tools/dump_ssim.exe -s -r sign_irene_cif.y4m - Opening sign_irene_cif.y4m... Opening -... Total: 0.967268 (Y': 0.964929 Cb: 0.971758 Cr: 0.97213 ) ffmpeg -i irene-unspec.h261 -f yuv4mpegpipe -v -1 - | ./daala/daala-HEAD-b2fa2c0/tools/dump_ssim.exe -s -r sign_irene_cif.y4m - Opening sign_irene_cif.y4m... Opening -... Warning: framerates do not match. info1.fps_n=25 info1.fps_d=1 info2.fps_n=30000 info2.fps_d=1001 Total: 0.900451 (Y': 0.889181 Cb: 0.930285 Cr: 0.915696) ffmpeg -i irene-362571.h261 -f yuv4mpegpipe -v -1 - | ./daala/daala-HEAD-b2fa2c0/tools/dump_ssim.exe -s -r sign_irene_cif.y4m - Opening sign_irene_cif.y4m... Opening -... Warning: framerates do not match. info1.fps_n=25 info1.fps_d=1 info2.fps_n=30000 info2.fps_d=1001 Total: 0.928367 (Y': 0.923392 Cb: 0.942237 Cr: 0.934402) ffmpeg -i irene-363k.cbp.ultrafast.264 -f yuv4mpegpipe -v -1 - | ./daala/daala-HEAD-b2fa2c0/tools/dump_ssim.exe -s -r sign_irene_cif.y4m - Opening sign_irene_cif.y4m... Opening -... Total: 0.934904 (Y': 0.925319 Cb: 0.956247 Cr: 0.951901) ./daala/daala-HEAD-b2fa2c0/tools/dump_ssim.exe -s -r sign_irene_cif.y4m sign_irene_cif.y4m Opening sign_irene_cif.y4m... Opening sign_irene_cif.y4m... Total: 1 (Y': 1 Cb: 1 Cr: 1 ) - Hervé