[MEncoder-users] problems with AVCHD (.mts) + Deinterlace + ofps
Grozdan
microchip at telenet.be
Mon Dec 22 00:48:04 CET 2008
On Monday 22 December 2008 00:39:05 Matt Henson wrote:
> Good day,
> I'm developing a product that uses mencoder to transcode user-generated
> content into H.264 video for viewing on the internet. I'm having difficulty
> with a specific case and would appreciate any help.
>
> Mencoder dev-SVN-r27749-4.1.2
>
> Input:
> AVCHD Video (.mts file from a Canon HF-100 HD video camera), 29.97fps,
> interlaced, 1920x1080
>
> Desired output:
> H.264 (.264 file) that will be muxed with MP4Box, 1280x720 (scaled from
> orig), progressive, 23.976fps (to reduce CPU requirement for viewing over
> the internet), 2.5 mb/sec
>
> I'm using YADIF to deinterlace. Since I don't want 60fps, I use mode 0.
>
> Here's my current mencoder command line (Pass 2 of the 2-pass shown. Pass 1
> is similar except for x264 options):
>
> mencoder "$1" -o "$outdir/${iFile%%.*}_temp.264" -demuxer lavf -passlogfile
> "$outdir/${iFile%%.*}"_temp.log -ovc x264 -x264encopts
> bitrate=$itemVideoBitrate:frameref=4:bframes=16:b_adapt:b_pyramid:weight_b:
>partitions=all:8x8dct:me=umh:subq=7:trellis=2:mixed_refs:brdo:threads=auto:p
>ass=2:analyse=all -of rawvideo -nosound -vf scale=1280:720,yadif=0 -fps
> 29.97 -ofps 23.976
-vf yadif=0,filmdint=fast=0/io=30:24/dint_thres=256 -fps 30000/1001 -ofps
24000/1001
>
> The actual output with this configuration is a video that's actually
> 29.97fps. So, when I mux it with the audio and tell Mp4box that the frame
> rate is 23.976, the resulting file is too long (in duration), the video is
> slow so the audio ends before the video does. I'm also getting a ton of
> duplicate frame warnings (output from mencoder is below)
>
> I've also tried:
> - Use yadif=1 and -fps 59.94, and the result was the same
> - Switch order of scale and yadif (In retrospect, I should go back to
> deinterlacing before scaling to improve video quality, but that's not the
> problem I'm trying to solve right now).
> - ofps=29.97, (or remove -ofps) and the resuting frame rate is correct
> (29.97).
>
> I use this same receipe with other videos (including lots of progressive
> scan as well as interlaced .m2t MPEG-2 HD videos from older HD cameras) and
> it has always given me the 23.976fps that I want.
>
> Here's what mencoder sends to the console:
> Opening video decoder: [ffmpeg] FFmpeg's libavcodec codec family
> Selected video codec: [ffh264] vfm: ffmpeg (FFmpeg H.264)
> ==========================================================================
> VDec: vo config request - 1920 x 1080 (preferred colorspace: Planar YV12)
> VDec: using Planar I420 as output csp (no 1)
> Movie-Aspect is 1.78:1 - prescaling to correct movie aspect.
> SwScaler: reducing / aligning filtersize 7 -> 8
> SwScaler: reducing / aligning filtersize 7 -> 8
> SwScaler: reducing / aligning filtersize 7 -> 6
> SwScaler: reducing / aligning filtersize 7 -> 6
> [swscaler @ 0x889b500]BICUBIC scaler, from yuv420p to yuv420p using MMX2
> [swscaler @ 0x889b500]using 8-tap MMX scaler for horizontal luminance
> scaling
> [swscaler @ 0x889b500]using 8-tap MMX scaler for horizontal chrominance
> scaling
> [swscaler @ 0x889b500]using n-tap MMX scaler for vertical scaling (YV12
> like)
> [swscaler @ 0x889b500]1920x1080 -> 1280x720
> x264 [info]: using SAR=1/1
> x264 [info]: using cpu capabilities: MMX2 SSE2Slow
> Pos: 0.0s 2f ( 2%) 0.00fps Trem: 0min 0mb A-V:0.000 [0:0]
> 1 duplicate frame(s)!
> Pos: 0.0s 3f ( 2%) 0.00fps Trem: 0min 0mb A-V:0.000 [0:0]
> 1 duplicate frame(s)!
> Pos: 0.1s 5f ( 3%) 0.00fps Trem: 0min 0mb A-V:0.000 [0:0]
> 1 duplicate frame(s)!
> Pos: 0.1s 6f ( 3%) 0.00fps Trem: 0min 0mb A-V:0.000 [0:0]
> 1 duplicate frame(s)!
> Pos: 0.2s 7f ( 3%) 0.00fps Trem: 0min 0mb A-V:0.000 [0:0]
> 1 duplicate frame(s)!
> Pos: 0.2s 8f ( 4%) 0.00fps Trem: 0min 0mb A-V:0.000 [0:0]
> 1 duplicate frame(s)!
> Pos: 0.3s 11f ( 4%) 0.00fps Trem: 0min 0mb A-V:0.000 [0:0]
> 1 duplicate frame(s)!
> Pos: 0.3s 13f ( 5%) 0.00fps Trem: 0min 0mb A-V:0.000 [0:0]
> 1 duplicate frame(s)!
> ---- Skipped a bunch of Duplicate Frame Warnings-----
> 1 duplicate frame(s)!
> Pos: 7.7s 253f (94%) 1.90fps Trem: 0min 1mb A-V:0.000 [1279:0]
> 1 duplicate frame(s)!
> Pos: 7.8s 257f (96%) 1.89fps Trem: 0min 1mb A-V:0.000 [1294:0]
> 1 duplicate frame(s)!
> Pos: 8.0s 261f (97%) 1.89fps Trem: 0min 1mb A-V:0.000 [1283:0]
> 1 duplicate frame(s)!
> Pos: 8.0s 263f (98%) 1.88fps Trem: 0min 1mb A-V:0.000 [1285:0]
> 1 duplicate frame(s)!
> Pos: 8.2s 267f (99%) 1.89fps Trem: 0min 1mb A-V:0.000 [1278:0]
> 1 duplicate frame(s)!
> Pos: 8.3s 270f (99%) 1.87fps Trem: 0min 1mb A-V:0.000 [1286:0]
> Flushing video frames.
>
> Video stream: 1315.195 kbit/s (164399 B/s) size: 1474219 bytes 8.967
> secs 270 frames
> x264 [info]: slice I:1 Avg QP:23.54 size: 69952
> x264 [info]: slice P:34 Avg QP:25.18 size: 23034
> x264 [info]: slice B:96 Avg QP:28.35 size: 6463
> x264 [info]: consecutive B-frames: 0.8% 0.0% 9.2% 86.2% 3.8% 0.0%
> 0.0% 0.0% 0.0% 0.0% 0.0% 0.0% 0.0% 0.0% 0.0% 0.0% 0.0%
> x264 [info]: mb I I16..4: 11.3% 69.4% 19.2%
> x264 [info]: mb P I16..4: 0.7% 10.0% 2.5% P16..4: 59.3% 8.3% 3.6%
> 0.0% 0.0% skip:15.6%
> x264 [info]: mb B I16..4: 0.0% 1.1% 0.6% B16..8: 34.2% 1.9% 1.6%
> direct: 1.9% skip:58.6% L0:33.3% L1:59.0% BI: 7.7%
> x264 [info]: 8x8 transform intra:72.0% inter:71.0%
> x264 [info]: ref P L0 76.6% 13.8% 6.5% 3.2%
> x264 [info]: ref B L0 90.1% 7.2% 2.7%
> x264 [info]: ref B L1 96.2% 3.8%
> x264 [info]: kb/s:2157.6
>
>
> --- MediaInfo on the Various Files----
> Source (MTS file)
> Duration : 4s 400ms
> Frame rate : 29.970 fps
> Frame Count : 133
>
>
> Intermediate video (.264)
> Frame rate : 23.976
> Frame Count : 133 <--- Should be ~106
>
> Final Video after mp4box and audio mux(.mp4)
> Duration : 5s 463ms
> Frame rate : 23.976 fps
> Frame Count : 133 <--- Should be ~106, see above
>
> Is there any other information needed to debug or solve this?
>
> Thanks in advance for any help with this!
> Cheers,
> mh
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--
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