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A/V sync issues encoding from huffyuv avi to mpeg2
by Brian Keener 14 Jun '05

14 Jun '05

OK, I've gotten through all my other problems, but a a/v sync issue remains. My original media, a huffyuv compressed avi with PCM sound data appears to have good a/v sync. When encoding to mpeg2 with: mencoder tv.avi -of mpeg -oac lavc -ovc lavc -lavcopts vcodec=mpeg2video:vbitrate=5000:keyint=25:acodec=mp2 -noskip -o tvout.mpg I get a fair amount of audio skew after about an hour; I'd estimate it to be around 1/10th of a second. Any ideas what I can check? Brian K

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RE Duplicate frames when encoding from TV?
by Carl Beech 14 Jun '05

14 Jun '05

>> Theoretically the new board should chew through tv capture using the >> same settings - but it isn't - I get a 'duplicate frame' message >> about every second, and I get approx 24fps. - The disk drive light is >> hardly 'on'. >What is wrong with getting a few "duplicate frame" messages? >As for V4L capture, I'm willing to bet you've got a VIA or SIS chipset >(ie. not Nforce), and have just found out the hard way that a lot of >motherboards just don't do proper DMA on the PCI bus, making them >useless with (uncompressed) TV capture cards. If you can, I suggest >returning the motherboard, and getting a different one. Buying from a >major brand doesn't help. It seems the only sure way to get a proper >motherboard anymore is to get one with an Nvidia Nforce chipset. - What's wrong is that the audio goes out of sync (which I can fix through avidemux2), and I get glitches within the video. As for the motherboard, its an abit, however, my last board didn't have a nforce chipset either. Thanks for the info about DMA - I'll look into it - perhaps moving the tv board (PCTV Rave) to another slot may make the difference.... As a matter of interest, watching TV directly through xawtv, I don't get any glitches.....? Carl.

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Duplicate frames when encoding from TV?
by Carl Beech 14 Jun '05

14 Jun '05

Hi, I've not sent a message to this mailing list before - if I've not got the right address / details please let me know! I've been using 'mencoder' for some time, and have achieved at 25fps 640x480 recording direct from the tv input (v4l), using lavcodec video and pcm audio. - All on a 1Ghz Duron processor with 256Mb memory. Over the last weekend I've upgraded my motherboard, processor and memory - I'm now running a 2.4Ghz Sempron with 512Mb (400mhz) memory. (I've kept my original disk drives) Theoretically the new board should chew through tv capture using the same settings - but it isn't - I get a 'duplicate frame' message about every second, and I get approx 24fps. - The disk drive light is hardly 'on'. I've re-compiled from the new 'pre7' release (admittedly the old setup used the 'pre6' - but I did install that from my own rpm's and it didn't seem to make any difference). Can someone tell me what I'm doing wrong? Many thanks in advance.... Carl Beech Stoke on Trent England.

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Mencoder adding AVI file header to MPEG2 capture from V4L device?
by Brian Keener 13 Jun '05

13 Jun '05

I'm trying to capture home movies from a bt848 device to hard disk, in preperation for creating a DVD using TMPGENC dvd author in Windows. I'm running under Mandrake 10.1 for the captures. I tried initially to use FFMPEG, but experienced some really poor performance, so I'm trying mencoder now. Here's my command line: mencoder -fps 30000/1001 -endpos 00:00:05 -oac mp3lame -ovc lavc -lameopts mode=1:vbr=1:q=4 -lavcopts vcodec=mpeg2video:vbitrate=6000 -tv driver=v4l2:norm=ntsc:input=2:adevice=/dev/dsp1:width=720:height=480 -vf harddup -af volume=-1 -o tv.mpg tv:// I'm ATTEMPTING to capture directly to MPEG2 video file. Here's the output from that command: MEncoder 1.0pre7-3.4.1 (C) 2000-2005 MPlayer Team CPU: Advanced Micro Devices Athlon MP/XP Thoroughbred (Family: 6, Stepping: 1) Detected cache-line size is 64 bytes CPUflags: Type: 6 MMX: 1 MMX2: 1 3DNow: 1 3DNow2: 1 SSE: 1 SSE2: 0 Compiled with runtime CPU detection - WARNING - this is not optimal! To get best performance, recompile MPlayer with --disable-runtime-cpudetection. 85 audio & 196 video codecs File not found: 'frameno.avi' Failed to open frameno.avi success: format: 9 data: 0x0 - 0x0 TV detected! ;-) Selected driver: v4l2 name: Video 4 Linux 2 input author: Martin Olschewski <olschewski(a)zpr.uni-koeln.de> comment: first try, more to come ;-) Selected device: BT878 video (Hauppauge (bt878)) Tuner cap: Tuner rxs: MONO STEREO Capabilites: video capture video overlay VBI capture device tuner read/write streaming supported norms: 0 = PAL; 1 = NTSC; 2 = SECAM; 3 = PAL-Nc; 4 = PAL-M; 5 = PAL-N; 6 = NTSC-JP; 7 = PAL-60; inputs: 0 = Television; 1 = Composite1; 2 = S-Video; 3 = Composite3; Current input: 2 Current format: YUV420 v4l2: current audio mode is : STEREO audio block size too low, setting to 16384! [V] filefmt:9 fourcc:0x32315659 size:720x480 fps:29.00 ftime:=0.0345 input fps will be interpreted as 29.97 instead ========================================================================== Opening audio decoder: [pcm] Uncompressed PCM audio decoder AUDIO: 44100 Hz, 2 ch, s16le, 1411.2 kbit/100.00% (ratio: 176400->176400) Selected audio codec: [pcm] afm:pcm (Uncompressed PCM) ========================================================================== Opening video filter: [expand osd=1] Expand: -1 x -1, -1 ; -1 (-1=autodetect) osd: 1 Opening video filter: [harddup] ========================================================================== Opening video decoder: [raw] RAW Uncompressed Video VDec: vo config request - 720 x 480 (preferred csp: Planar YV12) VDec: using Planar YV12 as output csp (no 0) Movie-Aspect is undefined - no prescaling applied. videocodec: libavcodec (720x480 fourcc=3267706d [mpg2]) Selected video codec: [rawyv12] vfm:raw (RAW YV12) ========================================================================== MP3 audio selected Building audio filter chain for 44100Hz/2ch/s16le -> 44100Hz/2ch/s16le... Writing AVI header... ODML: Aspect information not (yet?) available or unspecified, not writing vprp header. Forcing audio preload to 0, max pts correction to 0 New_Face failed. Maybe the font path is wrong. Please supply the text font file (~/.mplayer/subfont.ttf). subtitle font: load_sub_face failed. ODML: Aspect information not (yet?) available or unspecified, not writing vprp header. Pos: 5.0s 150f ( 0%) 24fps Trem: 0min 0mb A-V:0.000 [5334:156] Flushing video frames Writing AVI index... Fixing AVI header... ODML: Aspect information not (yet?) available or unspecified, not writing vprp header. Video stream: 5334.039 kbit/s (666754 bps) size: 3337108 bytes 5.005 secs 150 frames Audio stream: 156.943 kbit/s (19617 bps) size: 97881 bytes 4.989 secs v4l2: 183 frames successfully processed, 0 frames dropped. It says "writing AVI index/Fixing AVI header", and I can't figure out what I'm doing wrong. If I open the file using a hex editor, I definitely see the RIFF/etc. AVI header. man mencoder hasn't been much help either... Thanks for any assistance. Brian K

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Skipping frame! and duplicate frame(s)! problems
by Jonathan 12 Jun '05

12 Jun '05

Hello all, While trying to encode some of my DVDs for portability purposes I've run into problems with a lot of skipped and duplicated frames. I've Googled and searched the mailing lists a lot and found these two threads which are both rather old and don't help much although one does explain more clearly what the messages mean. http://www1.mplayerhq.hu/pipermail/mplayer-users/2002-January/010345.html http://www1.mplayerhq.hu/pipermail/mplayer-users/2002-February/011076.html My particular issue starts at around frame 3166 which is the opening credits which are a series of telecined clips in rapid sequence and the telecining does not match up between clips as far as I can tell. As you can see below mencoder changes the framerate which leads to a lot of skipped frames. Does the framerate really need to be changed? I've tried using the pullup filter with softskip as the documentation says but it does not seem to help things at all. I've tried so many things I can't even think of most of them now :P Any guidance / suggestions or requests for more information are greatly appreciated and will be tried as soon as possible. Thanks, Jonathan Please CC even though I am subscribed if you don't mind. desktop% sudo mencoder -nosound -ofps 24000/1001 -o /dev/null -ovc x264 -x264encopts pass=1:bitrate=952:bframes=2 dvd://1 Password: MEncoder 1.0pre7-3.4.2 (C) 2000-2005 MPlayer Team CPU: Advanced Micro Devices Athlon MP/XP/XP-M Barton (Family: 6, Stepping: 0) Detected cache-line size is 64 bytes CPUflags: Type: 6 MMX: 1 MMX2: 1 3DNow: 1 3DNow2: 1 SSE: 1 SSE2: 0 Compiled with runtime CPU detection - WARNING - this is not optimal! To get best performance, recompile MPlayer with --disable-runtime-cpudetection. File not found: 'frameno.avi' Failed to open frameno.avi Reading disc structure, please wait... There are 7 titles on this DVD. There are 16 chapters in this DVD title. There are 1 angles in this DVD title. DVD successfully opened. success: format: 0 data: 0x0 - 0x717ee000 MPEG-PS file format detected. VIDEO: MPEG2 720x480 (aspect 2) 29.970 fps 9800.0 kbps (1225.0 kbyte/s) [V] filefmt:2 fourcc:0x10000002 size:720x480 fps:29.97 ftime:=0.0334 Opening video filter: [expand osd=1] Expand: -1 x -1, -1 ; -1 (-1=autodetect) osd: 1 ========================================================================== Opening video decoder: [mpegpes] MPEG 1/2 Video passthrough VDec: vo config request - 720 x 480 (preferred csp: Mpeg PES) Could not find matching colorspace - retrying with -vf scale... Opening video filter: [scale] The selected video_out device is incompatible with this codec. VDecoder init failed :( Opening video decoder: [libmpeg2] MPEG 1/2 Video decoder libmpeg2-v0.4.0b Selected video codec: [mpeg12] vfm:libmpeg2 (MPEG-1 or 2 (libmpeg2)) ========================================================================== Writing AVI header... ODML: Aspect information not (yet?) available or unspecified, not writing vprp header. VDec: vo config request - 720 x 480 (preferred csp: Planar YV12) Could not find matching colorspace - retrying with -vf scale... Opening video filter: [scale] VDec: using Planar YV12 as output csp (no 0) Movie-Aspect is 1.33:1 - prescaling to correct movie aspect. SwScaler: using unscaled Planar YV12 -> Planar YV12 special converter x264 [info]: using SAR=8/9 x264 [info]: using cpu capabilities MMX MMXEXT SSE 3DNow! Pos: 0.0s 1f ( 0%) 0fps Trem: 0min 0mb A-V:0.000 [0:0] 1 duplicate frame(s)! ODML: vprp aspect is 4:3. Pos: 0.0s 3f ( 0%) 0fps Trem: 0min 0mb A-V:0.000 [0:0] 1 duplicate frame(s)! ODML: vprp aspect is 4:3. ODML: vprp aspect is 4:3. 0fps Trem: 0min 0mb A-V:0.000 [0:0] Pos: 0.4s 11f ( 0%) 0fps Trem: 0min 0mb A-V:0.000 [0:0] demux_mpg: 24000/1001fps progressive NTSC content detected, switching framerate. Pos: 8.7s 211f ( 0%) 6fps Trem: 230min 0mb A-V:0.000 [1171:0] demux_mpg: 30000/1001fps NTSC content detected, switching framerate. Warning! FPS changed 23.976 -> 29.970 (-5.994000) [4] :0.000 [1172:0] Pos: 9.1s 220f ( 0%) 6fps Trem: 227min 0mb A-V:0.000 [1202:0] Skipping frame! Pos: 9.3s 225f ( 0%) 6fps Trem: 227min 1mb A-V:0.000 [1225:0] Skipping frame! Pos: 9.4s 230f ( 0%) 6fps Trem: 226min 0mb A-V:0.000 [1232:0] Skipping frame! Pos: 9.6s 235f ( 0%) 6fps Trem: 223min 0mb A-V:0.000 [1236:0] Skipping frame! Pos: 9.8s 240f ( 0%) 6fps Trem: 221min 0mb A-V:0.000 [1229:0] Skipping frame! Pos: 10.4s 257f ( 0%) 6fps Trem: 216min 0mb A-V:0.000 [1195:0] demux_mpg: 24000/1001fps progressive NTSC content detected, switching framerate. Pos: 87.6s 2109f ( 3%) 6fps Trem: 152min 0mb A-V:0.000 [958:0]] demux_mpg: 30000/1001fps NTSC content detected, switching framerate. Warning! FPS changed 23.976 -> 29.970 (-5.994000) [4] :0.000 [959:0] Pos: 88.0s 2118f ( 3%) 6fps Trem: 153min 0mb A-V:0.000 [962:0] Skipping frame! Pos: 88.3s 2125f ( 3%) 6fps Trem: 153min 0mb A-V:0.000 [963:0] Skipping frame! Pos: 88.6s 2134f ( 3%) 6fps Trem: 153min 0mb A-V:0.000 [963:0] demux_mpg: 24000/1001fps progressive NTSC content detected, switching framerate. Pos: 131.6s 3166f ( 5%) 7fps Trem: 146min 0mb A-V:0.000 [946:0] demux_mpg: 30000/1001fps NTSC content detected, switching framerate. Warning! FPS changed 23.976 -> 29.970 (-5.994000) [4] :0.000 [945:0] Pos: 132.0s 3175f ( 5%) 7fps Trem: 145min 0mb A-V:0.000 [961:0] Skipping frame! Pos: 132.2s 3180f ( 5%) 7fps Trem: 145min 0mb A-V:0.000 [964:0] Skipping frame! Pos: 132.3s 3185f ( 5%) 7fps Trem: 145min 0mb A-V:0.000 [965:0] Skipping frame! Pos: 132.7s 3195f ( 5%) 7fps Trem: 145min 0mb A-V:0.000 [968:0] Skipping frame! Pos: 132.8s 3200f ( 5%) 7fps Trem: 145min 0mb A-V:0.000 [968:0] Skipping frame! Pos: 133.2s 3210f ( 5%) 7fps Trem: 145min 0mb A-V:0.000 [971:0] Skipping frame! Pos: 133.3s 3215f ( 5%) 7fps Trem: 145min 0mb A-V:0.000 [974:0] Skipping frame! Pos: 133.5s 3220f ( 5%) 7fps Trem: 145min 0mb A-V:0.000 [975:0] Skipping frame! Pos: 133.8s 3230f ( 5%) 7fps Trem: 145min 0mb A-V:0.000 [976:0] Skipping frame! Pos: 134.2s 3240f ( 5%) 7fps Trem: 145min 0mb A-V:0.000 [975:0] Skipping frame! Pos: 134.3s 3245f ( 5%) 7fps Trem: 144min 0mb A-V:0.000 [975:0] Skipping frame! Pos: 134.7s 3255f ( 5%) 7fps Trem: 144min 0mb A-V:0.000 [975:0] Skipping frame! Pos: 135.0s 3265f ( 5%) 7fps Trem: 144min 0mb A-V:0.000 [973:0] Skipping frame! Pos: 135.2s 3270f ( 5%) 7fps Trem: 144min 0mb A-V:0.000 [976:0] Skipping frame! Pos: 135.5s 3280f ( 5%) 7fps Trem: 144min 0mb A-V:0.000 [978:0] Skipping frame! ^CPos: 135.6s 3282f ( 5%) 7fps Trem: 144min 0mb A-V:0.000 [978:0] Flushing video frames Writing AVI index... Fixing AVI header... ODML: vprp aspect is 4:3. Video stream: 979.123 kbit/s (122390 bps) size: 16600476 bytes 135.635 secs 3282 frames x264 [info]: slice I:42 Avg QP:20.43 Avg size: 32813 x264 [info]: slice P:1393 Avg QP:22.93 Avg size: 7685 x264 [info]: slice B:1815 Avg QP:24.99 Avg size: 2488 x264 [info]: slice I Avg I4x4:54.2% I16x16:45.8% x264 [info]: slice P Avg I4x4:7.7% I16x16:13.4% P:38.2% P8x8:3.2% PSKIP:37.4% x264 [info]: slice B Avg I4x4:1.2% I16x16:1.0% P:17.8% B:6.0% B8x8:1.4% DIRECT:3.6% BSKIP:69.0% x264 [info]: kb/s:979.6

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vrc_minrate minimum?
by Jan Paul Schmidt 12 Jun '05

12 Jun '05

While encoding with MPEG I stumbled over the warning: [mpeg2video @ 0x855f020]Warning min_rate > 0 but min_rate != max_rate isn't recommended! This comes directly from mpegvideo.c in libavcodec. The interesting point is, you can't specify vrc_minrate=0 because the allowed minimum is defined as 4 in libmpcodecs/ve_lavc.c. ffmpeg itself uses minrate=0 in the targets (-target) svcd and dvd, so this should do no harm, no? jps --- ve_lavc.c.orig 2005-06-12 14:14:50.000000000 +0200 +++ ve_lavc.c 2005-06-12 14:15:17.000000000 +0200 @@ -207,7 +207,7 @@ {"vrc_eq", &lavc_param_rc_eq, CONF_TYPE_STRING, 0, 0, 0, NULL}, {"vrc_override", &lavc_param_rc_override_string, CONF_TYPE_STRING, 0, 0, 0, NULL}, {"vrc_maxrate", &lavc_param_rc_max_rate, CONF_TYPE_INT, CONF_RANGE, 4, 24000000, NULL}, - {"vrc_minrate", &lavc_param_rc_min_rate, CONF_TYPE_INT, CONF_RANGE, 4, 24000000, NULL}, + {"vrc_minrate", &lavc_param_rc_min_rate, CONF_TYPE_INT, CONF_RANGE, 0, 24000000, NULL}, {"vrc_buf_size", &lavc_param_rc_buffer_size, CONF_TYPE_INT, CONF_RANGE, 4, 24000000, NULL}, {"vrc_buf_aggressivity", &lavc_param_rc_buffer_aggressivity, CONF_TYPE_FLOAT, CONF_RANGE, 0.0, 99.0, NULL}, {"vrc_init_cplx", &lavc_param_rc_initial_cplx, CONF_TYPE_FLOAT, CONF_RANGE, 0.0, 9999999.0, NULL},

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a-v synchronization problems of some NTSC DVDs with -oac copy
by David Soukal 11 Jun '05

11 Jun '05

Hello, I have recently ran into A-V synchronization problems while encoding some NTSC DVDs. I looked at the mailing list archive and found very similar symptoms in a thread by Corey Hickey on March 15th ("a-v sync problems with pullup, softskip (only on some DVDs)"). I have studied the answers but I was unable to fix the problem. It seems that the problem was a bug in the code that has been fixed. But I didn't find a reference to the version of MPlayer that has the bug fixed. I'm using version 1.0pre6 compiled from sources on a Gentoo system (For Gentoo users: I had to recompile MPlayer recently with the dts flag to get FFMPEG support again.) To reiterate the problems. I have noticed a short sync delay (of order of ms) with some DVDs that I converted while there was no sync problem with other DVDs. All the DVDs are in the NTSC format. The original DVDs show no sync problems, of course. The problematic DVDs are stored progressive with exception of a couple of short scenes with telecined content. I used the following command line for the encoding: mencoder -vf pullup=2:2:4:4,softskip,crop=704:368:8:60 -ofps 23.976 -oac copy -ovc xvid -xvidencopts pass=1:${xvidencopts} -o movie.avi where $xvidencopts is xvidencopts="bitrate=1800:me_quality=6:nointerlacing:noqpel:gmc:trellis:quant_type=mpeg: vhq=4:autoaspect:chroma_opt:hq_ac:min_iquant=1:min_pquant=1:min_bquant=1". I use the same commands (with exception of the cropping parameters and bitrate) for all DVDs, with some it works with other I get the problem. So it seems that the problem must be in the DVDs themselves. Some observations that I made: 1) the sync problem would be there even if I omitted pullup and softskip filters. One DVD that I have has first telecined content in the middle of the movie, however the sync problems would be there from the very beginning (with or without pullup,softskip) 2) there would be no sync problem if I compressed the audio stream with lame instead of just copying it. 3) MEncoder issues "1 duplicte frame(s) found" warning now and then. A small fragment of the log: Pos: 0.0s 2f ( 0%) 0fps Trem: 0min 0mb A-V:0.000 [0:0] 1 duplicate frame(s)! ODML: vprp aspect is 16384:7220. ODML: vprp aspect is 16384:7220. Trem: 0min 0mb A-V:0.000 [0:0] 1 duplicate frame(s)! Pos: 0.3s 10f ( 0%) 0fps Trem: 0min 0mb A-V:0.000 [0:0] demux_mpg: 24fps progressive NTSC content detected, switching framerate. Pos: 17.4s 421f ( 0%) 53fps Trem: 48min 2133mb A-V:0.000 [2801:0] 1 duplicate frame(s)! Pos: 230.8s 5539f ( 4%) 45fps Trem: 44min 1007mb A-V:0.000 [1631:0] 1 duplicate frame(s)! Pos: 255.5s 6131f ( 4%) 45fps Trem: 43min 964mb A-V:0.000 [1554:0]] 1 duplicate frame(s)! Pos: 268.3s 6437f ( 5%) 45fps Trem: 43min 944mb A-V:0.000 [1518:0] 1 duplicate frame(s)! Pos: 269.2s 6459f ( 5%) 45fps Trem: 43min 943mb A-V:0.000 [1515:0] 1 duplicate frame(s)! Pos: 270.8s 6497f ( 5%) 45fps Trem: 43min 940mb A-V:0.000 [1509:0] 1 duplicate frame(s)! Pos: 275.4s 6607f ( 5%) 45fps Trem: 43min 933mb A-V:0.000 [1497:0] ... Is the message "duplicate frame(s)" a good or a bad thing? (I wasn't able to make out the right answer in the responses in Corey's thread) Why does it appear in progressive content? 4) I use Windows Smartripper to backup the DVDs and MPlayer seems to have wrong information about the length of the movie (checked on the OSD display). However the result is always OK (as far as length is concerned). I'm including this observation here only for completeness. (BTW: I have a very small Linux partition (3GB) so I have to grab the DVD on a Windows partition) 5) the sync problems exist only for some mixed-content DVDs not all of them. I'm using MEncoder only for a couple of months now. So I'm no expert. If I overlooked something obvious, I apologize in advance! Thank you for your thoughts/comments. David

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avi for mediaplayer
by Evert, Frits van 07 Jun '05

07 Jun '05

When I encode a series of jpg images with the command mencoder "mf://*.jpg" -mf fps=25 -o output.avi -ovc lavc -lavcopts vcodec=wmv2 the resulting file plays fine in mplayer but stops after a few frames when played in Windows Media player or in RealPlayer. Can anybody tell me why? My platform is WinXP with mplayer 1.0pre7. Thanks in advance for your help. Frits

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MPEG1 with constant bitrate
by Jan Paul Schmidt 06 Jun '05

06 Jun '05

Hi there, I'm trying to get a MPEG1 video with constant bitrate with lavc. The lavc options are: vcodec=mpeg1video:vbitrate=600:vrc_maxrate=600:vrc_minrate=600 But this all does not give me a constant bitrate when checking with mplayer -oac copy -ovc copy -o /dev/null video.mpg The bitrate is not exactly 600 but somewhere near 600. Is it possible to create a constant bitrate with lavc or do I need to use mjpegtools? jps

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How to define DivX version
by oleg dov 05 Jun '05

05 Jun '05

I already tried some parameters, but no good results. Peoples found out that for this DVD-player need to use such version of codec. I use mencoder with -ovc lavc - as I know it's libavcodec codec, but it didn't help. And enother question - if I will setup divx 5.1, which file I should set for "codecs-file" option? Thanks

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