[FFmpeg-user] AVCHD recoding problem

[Mark Himsley]

On 05/06/2011 16:52, Tisch Dániel wrote:
> Hi,

Hi Tisch,

> I want to recode files produced by an AVCHD camera. These are MTSs with
> H.264 video, AC3 audio and PGS subtitle. I am trying to use the
> following command:
> ffmpeg -top 1 -i test.mts -vcodec libx264 -top 1 -crf 23.0 -preset
> slower -tune fastdecode -acodec copy -sn -threads 5 test.mp4

-top 1 before your input .mts file is doing nothing.

> My problem is, that x264 encodes video as 50FPS progressive, however it
> is 25FPS top-field-first. I also tried adding -x264opts "tff=1", but
> nothing changed.

I don't mean to sould rude, but are you really sure test.mts is 25i?
If it isn't too large, can you upload it?
Can you also tellus where it came from, which AVCHD camera.

Thanks.

> What can I do to get correct scan type during the whole process?
>
> I got this output:
>
> ffmpeg version git-N-30558-ge844abc, Copyright (c) 2000-2011 the FFmpeg
> developers
> built on Jun 5 2011 15:41:41 with gcc 4.4.3
> configuration: --arch=x86_64 --enable-shared --enable-gpl
> --enable-nonfree --enable-runtime-cpudetect --enable-libfaac
> --enable-libtheora --enable-libx264 --enable-libmp3lame
> libavutil 51. 4. 0 / 51. 4. 0
> libavcodec 53. 6. 1 / 53. 6. 1
> libavformat 53. 2. 0 / 53. 2. 0
> libavdevice 53. 1. 1 / 53. 1. 1
> libavfilter 2. 12. 0 / 2. 12. 0
> libswscale 0. 14. 1 / 0. 14. 1
> libpostproc 51. 2. 0 / 51. 2. 0
>
> Seems stream 0 codec frame rate differs from container frame rate: 50.00
> (50/1) -> 50.00 (50/1)
> Input #0, mpegts, from 'test.mts':
> Duration: 00:01:00.87, start: 1.000033, bitrate: 22363 kb/s
> Program 1
> Stream #0.0[0x1011]: Video: h264 (High), yuv420p, 1920x1080 [PAR 1:1 DAR
> 16:9], 50 fps, 50 tbr, 90k tbn, 50 tbc
> Stream #0.1[0x1100]: Audio: ac3, 48000 Hz, stereo, s16, 256 kb/s
> Stream #0.2[0x1200]: Subtitle: pgssub
> [buffer @ 0xe83a00] w:1920 h:1080 pixfmt:yuv420p tb:1/1000000 sar:1/1
> sws_param:
> [libx264 @ 0xe76760] using SAR=1/1
> [libx264 @ 0xe76760] using cpu capabilities: MMX2 SSE2Fast SSSE3
> FastShuffle SSE4.2
> [libx264 @ 0xe76760] profile High, level 5.0
> [libx264 @ 0xe76760] 264 - core 115 - H.264/MPEG-4 AVC codec - Copyleft
> 2003-2011 - http://www.videolan.org/x264.html - options: cabac=0 ref=8
> deblock=0:0:0 analyse=0x3:0x133 me=umh subme=9 psy=1 psy_rd=1.00:0.00
> mixed_ref=1 me_range=16 chroma_me=1 trellis=2 8x8dct=1 cqm=0
> deadzone=21,11 fast_pskip=1 chroma_qp_offset=-2 threads=5
> sliced_threads=0 nr=0 decimate=1 interlaced=0 bluray_compat=0
> constrained_intra=0 bframes=3 b_pyramid=2 b_adapt=2 b_bias=0 direct=3
> weightb=0 open_gop=1 weightp=0 keyint=250 keyint_min=25 scenecut=40
> intra_refresh=0 rc_lookahead=60 rc=crf mbtree=1 crf=23.0 qcomp=0.60
> qpmin=0 qpmax=69 qpstep=4 ip_ratio=1.40 aq=1:1.00
> Output #0, mp4, to 'test.mp4':
> Metadata:
> encoder : Lavf53.2.0
> Stream #0.0: Video: libx264, yuv420p, 1920x1080 [PAR 1:1 DAR 16:9],
> q=2-31, 200 kb/s, 50 tbn, 50 tbc
> Stream #0.1: Audio: ac3, 48000 Hz, stereo, 256 kb/s
> Stream mapping:
> Stream #0.0 -> #0.0
> Stream #0.1 -> #0.1
> Press [q] to stop, [?] for help
> frame= 70 fps= 3 q=31.0 Lsize= 1877kB time=00:00:01.22
> bitrate=12565.3kbits/s dup=36 drop=0
> video:1838kB audio:37kB global headers:0kB muxing overhead 0.129483%
> frame I:1 Avg QP:24.66 size:244547
> [libx264 @ 0xe76760] frame P:30 Avg QP:25.73 size: 46540
> [libx264 @ 0xe76760] frame B:39 Avg QP:32.16 size: 6169
> [libx264 @ 0xe76760] consecutive B-frames: 21.4% 0.0% 38.6% 40.0%
> [libx264 @ 0xe76760] mb I I16..4: 4.9% 62.3% 32.9%
> [libx264 @ 0xe76760] mb P I16..4: 0.2% 0.5% 0.1% P16..4: 38.0% 15.2%
> 2.1% 0.1% 0.1% skip:43.6%
> [libx264 @ 0xe76760] mb B I16..4: 0.0% 0.0% 0.0% B16..8: 30.3% 1.6% 0.2%
> direct: 1.0% skip:66.9% L0:44.2% L1:50.8% BI: 5.0%
> [libx264 @ 0xe76760] 8x8 transform intra:62.6% inter:49.6%
> [libx264 @ 0xe76760] direct mvs spatial:94.9% temporal:5.1%
> [libx264 @ 0xe76760] coded y,uvDC,uvAC intra: 85.6% 85.6% 44.4% inter:
> 11.7% 13.1% 0.1%
> [libx264 @ 0xe76760] i16 v,h,dc,p: 39% 11% 4% 46%
> [libx264 @ 0xe76760] i8 v,h,dc,ddl,ddr,vr,hd,vl,hu: 17% 9% 5% 8% 12% 16%
> 11% 13% 10%
> [libx264 @ 0xe76760] i4 v,h,dc,ddl,ddr,vr,hd,vl,hu: 11% 14% 3% 9% 14%
> 15% 13% 10% 11%
> [libx264 @ 0xe76760] i8c dc,h,v,p: 41% 17% 25% 17%
> [libx264 @ 0xe76760] ref P L0: 60.6% 11.9% 15.8% 3.4% 2.0% 2.5% 2.4% 1.4%
> [libx264 @ 0xe76760] ref B L0: 85.1% 5.6% 5.3% 2.0% 0.7% 0.8% 0.5%
> [libx264 @ 0xe76760] ref B L1: 97.1% 2.9%
> [libx264 @ 0xe76760] kb/s:10750.62
>
>
> Thanks!
> Daniel

-- 
Mark