July 2011 - MEncoder-users - lists.mplayerhq.hu

27 Apr '13

Hi, I wanted to combine 12 flash video files (from youtube) into a single avi file. So I did cat at Zachar*.flv > Zach_all.flv $ mencoder Zach_all.flv -o Zach_all.avi -forceidx -ovc copy -oac pcm The output shows skipping frames, and missing aspect information, as you see below. What do I need to do to fix that, so thet when I am transcoding into .avi, I do not get these skips and missing aspect info? MEncoder SVN-r31628-4.4.5 (C) 2000-2010 MPlayer Team success: format: 0 data: 0x0 - 0x8378f0a libavformat file format detected. [flv @ 0x92d07a0] Estimating duration from bitrate, this may be inaccurate [lavf] stream 0: video (h264), -vid 0 [lavf] stream 1: audio (aac), -aid 0 VIDEO: [H264] 480x270 0bpp 29.917 fps 119.2 kbps (14.5 kbyte/s) [V] filefmt:44 fourcc:0x34363248 size:480x270 fps:29.917 ftime:=0.0334 ========================================================================== Opening audio decoder: [faad] AAC (MPEG2/4 Advanced Audio Coding) AUDIO: 44100 Hz, 2 ch, s16le, 49.5 kbit/3.51% (ratio: 6184->176400) Selected audio codec: [faad] afm: faad (FAAD AAC (MPEG-2/MPEG-4 Audio)) ========================================================================== videocodec: framecopy (480x270 0bpp fourcc=34363248) Writing header... ODML: Aspect information not (yet?) available or unspecified, not writing vprp header. Writing header... ODML: Aspect information not (yet?) available or unspecified, not writing vprp header. Pos: 0.7s 21f ( 0%) 14.38fps Trem: 0min 0mb A-V:0.067 [0:1411] Skipping frame! Pos: 1.1s 33f ( 0%) 18.45fps Trem: 0min 0mb A-V:0.068 [150:1411] Skipping frame! Pos: 6.0s 182f ( 0%) 38.81fps Trem: 65min 1014mb A-V:0.067 [148:1411] Skipping frame! Pos: 23.5s 706f ( 0%) 43.90fps Trem: 70min 1142mb A-V:0.067 [106:1411] Skipping frame! Pos: 38.4s 1153f ( 0%) 44.83fps Trem: 68min 1147mb A-V:0.067 [113:1411] Skipping frame! Pos: 57.4s 1723f ( 0%) 44.84fps Trem: 66min 1117mb A-V:0.068 [124:1411] Skipping frame! Pos: 76.9s 2306f ( 1%) 44.36fps Trem: 65min 1089mb A-V:0.067 [128:1411] Skipping frame! Pos: 98.4s 2950f ( 1%) 44.17fps Trem: 65min 1092mb A-V:0.067 [126:1411] Skipping frame! Pos: 117.5s 3522f ( 1%) 43.68fps Trem: 65min 1086mb A-V:0.067 [128:1411] Skipping frame! Pos: 132.5s 3972f ( 2%) 43.76fps Trem: 66min 1092mb A-V:0.067 [127:1411] Skipping frame! Pos: 153.7s 4608f ( 2%) 44.14fps Trem: 66min 1104mb A-V:0.067 [126:1411] Skipping frame! Pos: 173.1s 5190f ( 2%) 43.84fps Trem: 68min 1133mb A-V:0.067 [120:1411] Skipping frame! Pos: 190.3s 5705f ( 3%) 44.08fps Trem: 67min 1122mb A-V:0.067 [121:1411] Skipping frame! Pos: 211.7s 6347f ( 3%) 43.80fps Trem: 66min 1114mb A-V:0.068 [124:1411] Skipping frame! Pos: 228.7s 6856f ( 3%) 43.84fps Trem: 66min 1113mb A-V:0.067 [124:1411] Skipping frame! Pos: 248.1s 7436f ( 4%) 44.06fps Trem: 65min 1110mb A-V:0.067 [125:1411] Skipping frame! Pos: 265.3s 7954f ( 4%) 43.82fps Trem: 66min 1120mb A-V:0.067 [123:1411] Skipping frame!

5 28

Help with MPG video encoding
by Walter Belhaven 20 Apr '13

20 Apr '13

Hi, I've got a question on how to get the best possible MPG encoding of a movie source, "at any price" so to speak -- i.e., as many bits as the encoder needs to get the highest possible video quality. It appears to me that the MPG encoding process is introducing artifacts that are present regardless of the amount of "free reign" I give to the encoder with respect to quantization, bitrate, and the like. My bottom line question is thus: "Are these artifacts inherent in MPG encoding, or am I just not twiddling the knobs and dials on the encoder correctly?" Here's all the details ... My source is a mixed hard- and soft-telecined "movie" at 1080/60i that I'm trying to tanscode to 480/24p, soft telecined to 480/60i, for ultimate burning to an NTSC DVD-Video. When I use mencoder to inverse telecine, crop out the crud, expand back to the original letterbox ratio (it's 2.35:1, not 16/9), and 'encode' the video with HUFFYUV (422P), the resulting video looks stunning, with no 'blocking' artifacts to speak of. This, of course, is as expected. But when I encode the video in MPG2 or MPG4, even with vqscale=1 or vqscale=2, I see sometimes severe blocking in the resulting video. Is this because the chroma is being subsampled vertically and horizontally (4:2:0), or is it because 'vqscale' is (perhaps necessary but) not sufficient to get "maximum quality at any price" encoding? Thanks, WB ____________________________________________________________________________________ Be a PS3 game guru. Get your game face on with the latest PS3 news and previews at Yahoo! Games. http://videogames.yahoo.com/platform?platform=120121

3 9

transcoding from variable framerate MP4 to avi, a/v sync problem - video stream much shorter
by SilentShade 08 Aug '11

08 Aug '11

Hello everybody. I'm trying make an all-in-one transcoder for any types of video, for web streaming. The output is AVC/AAC in MP4 container. For that i use the following techique: 1. Encode input to avc/aac and remux it to avi container. (mencoder) 2. Demux audio and video steams into separate files 3. Mux to mp4 with gpac MP4Box I ran into problem with an input mp4 file having variable framerate. The sample command for stage 1 is: mencoder -af volnorm=2 -oac faac -faacopts br=98:mpeg=4:object=2 -channels 2 -srate 44100 -ovc x264 -x264encopts bitrate=500:subq=5:frameref=6:cabac:threads=auto:bframes=3:b_pyramid=normal:weight_b -ofps 30000/1001 -vf pp=hb/vb/lb,dsize=960:720:0,scale=-8:-8,harddup infile.mp4 -o tmp.avi The input file is about 10 minutes long and has more then 4500 frames. Mencoder continues up to ~780-th frame, and then tells: Too many audio packets in the buffer: (4096 in 1067205 bytes). Maybe you are playing a non-interleaved stream/file or the codec failed? For AVI files, try to force non-interleaved mode with the -ni option. The result file is 28 seconds long, and a video stream is fast forward.. Audio stream is at normal speed. I had similar problem with encodinf VBR vmw files, and it was solved by adding source max frame rate with -ofps option. However this doesn't work with mp4 source. Any help would be much appreciated. Thanks. Input file mediainfo: Format : MPEG-4 Format profile : Base Media / Version 2 Codec ID : mp42 File size : 21.0 MiB Duration : 11mn 4s Overall bit rate : 265 Kbps Encoded date : UTC 2011-05-23 07:40:27 Tagged date : UTC 2011-05-23 07:41:00 Writing application : HandBrake 0.9.5 2011010300 Video ID : 1 Format : AVC Format/Info : Advanced Video Codec Format profile : High(a)L3.1 Format settings, CABAC : Yes Format settings, ReFrames : 4 frames Codec ID : avc1 Codec ID/Info : Advanced Video Coding Duration : 11mn 4s Bit rate mode : Variable Bit rate : 164 Kbps Nominal bit rate : 300 Kbps Width : 960 pixels Height : 600 pixels Display aspect ratio : 1.600 Frame rate mode : Variable Frame rate : 6.802 fps Minimum frame rate : 0.595 fps Maximum frame rate : 29.970 fps Color space : YUV Chroma subsampling : 4:2:0 Bit depth : 8 bits Scan type : Progressive Bits/(Pixel*Frame) : 0.042 Stream size : 13.0 MiB (62%) Writing library : x264 core 112 Encoding settings : cabac=1 / ref=3 / deblock=1:0:0 / analyse=0x3:0x113 / me=hex / subme=7 / psy=1 / psy_rd=1.00:0.00 / mixed_ref=1 / me_range=16 / chroma_me=1 / trellis=1 / 8x8dct=1 / cqm=0 / deadzone=21,11 / fast_pskip=1 / chroma_qp_offset=-2 / threads=12 / sliced_threads=0 / nr=0 / decimate=1 / interlaced=0 / constrained_intra=0 / bframes=3 / b_pyramid=2 / b_adapt=2 / b_bias=0 / direct=1 / weightb=1 / open_gop=0 / weightp=2 / keyint=70 / keyint_min=6 / scenecut=40 / intra_refresh=0 / rc_lookahead=50 / rc=abr / mbtree=1 / bitrate=300 / ratetol=1.0 / qcomp=0.60 / qpmin=3 / qpmax=51 / qpstep=4 / ip_ratio=1.40 / aq=1:1.00 Encoded date : UTC 2011-05-23 07:40:27 Tagged date : UTC 2011-05-23 07:41:00 Color primaries : BT.601-6 525, BT.1358 525, BT.1700 NTSC, SMPTE 170M Transfer characteristics : BT.709-5, BT.1361 Matrix coefficients : BT.601-6 525, BT.1358 525, BT.1700 NTSC, SMPTE 170M Audio ID : 2 Format : AAC Format/Info : Advanced Audio Codec Format profile : LC Codec ID : 40 Duration : 11mn 4s Bit rate mode : Variable Bit rate : 98.6 Kbps Maximum bit rate : 128 Kbps Channel(s) : 1 channel Channel positions : Front: C Sampling rate : 48.0 KHz Compression mode : Lossy Stream size : 7.81 MiB (37%) Language : English Encoded date : UTC 2011-05-23 07:40:27 Tagged date : UTC 2011-05-23 07:41:00 Output mediainfo: Format : AVI Format/Info : Audio Video Interleave File size : 915 KiB Duration : 26s 378ms Overall bit rate : 284 Kbps Writing application : MEncoder SVN-r32726-4.4.3 Writing library : MPlayer Video ID : 0 Format : AVC Format/Info : Advanced Video Codec Format profile : High(a)L3.1 Format settings, CABAC : Yes Format settings, ReFrames : 6 frames Codec ID : h264 Duration : 25s 859ms Bit rate : 174 Kbps Nominal bit rate : 164 Kbps Width : 960 pixels Height : 608 pixels Display aspect ratio : 1.599 Frame rate : 29.970 fps Color space : YUV Chroma subsampling : 4:2:0 Bit depth : 8 bits Scan type : Progressive Bits/(Pixel*Frame) : 0.010 Stream size : 550 KiB (60%) Writing library : x264 core 110 r1820 fdcf2ae Encoding settings : cabac=1 / ref=6 / deblock=1:0:0 / analyse=0x3:0x113 / me=hex / subme=5 / psy=1 / psy_rd=0.00:0.00 / mixed_ref=1 / me_range=16 / chroma_me=1 / trellis=1 / 8x8dct=1 / cqm=0 / deadzone=21,11 / fast_pskip=1 / chroma_qp_offset=0 / threads=6 / sliced_threads=0 / nr=0 / decimate=1 / interlaced=0 / constrained_intra=0 / bframes=3 / b_pyramid=2 / b_adapt=1 / b_bias=0 / direct=1 / weightb=1 / open_gop=0 / weightp=2 / keyint=250 / keyint_min=25 / scenecut=40 / intra_refresh=0 / rc_lookahead=40 / rc=abr / mbtree=1 / bitrate=164 / ratetol=1.0 / qcomp=0.60 / qpmin=0 / qpmax=51 / qpstep=4 / ip_ratio=1.40 / aq=1:1.00 Audio ID : 1 Format : 706D Codec ID : 706D Duration : 26s 378ms Bit rate : 98.1 Kbps Channel(s) : 1 channel Sampling rate : 44.1 KHz Stream size : 316 KiB (35%) Interleave, duration : 23 ms (0.68 video frame) Interleave, preload duration : 2107 ms

2 1

-oac copy and -of lavf shows audio data info wrong for flv videos.
by Bill Crockett 03 Aug '11

03 Aug '11

When stream copying avc and aac with an flv container, the clip info of the audio data rate is showing completely wrong in Mplayer and MediaInfo. The command line: mencoder -ovc copy -oac copy -of lavf -lavfopts format=flv -fafmttag 0x706d infile.flv -o outfile.flv MEncoder Sherpya-SVN-r33883-4.2.5 (C) 2000-2011 MPlayer Team 163 audio & 369 video codecs success: format: 0 data: 0x0 - 0x5a2303 libavformat file format detected. [lavf] stream 0: video (h264), -vid 0 [lavf] stream 1: audio (aac), -aid 0, -alang und VIDEO: [H264] 640x360 24bpp 29.970 fps 685.6 kbps (83.7 kbyte/s) [V] filefmt:44 fourcc:0x34363248 size:640x360 fps:29.970 ftime:=0.0334 ** MUXER_LAVF ***************************************************************** REMEMBER: MEncoder's libavformat muxing is presently broken and can generate INCORRECT files in the presence of B-frames. Moreover, due to bugs MPlayer will play these INCORRECT files as if nothing were wrong! ******************************************************************************* OK, exit. videocodec: framecopy (640x360 24bpp fourcc=34363248) Forcing output audio format tag to 0x706d. audiocodec: framecopy (format=706d chans=2 rate=44100 bits=16 B/s=11999 sample-0) VIDEO CODEC ID: 28 AUDIO CODEC ID: 15002, TAG: 0 Writing header... [flv @ 0212b280] Codec for stream 0 does not use global headers but container format requires global headers [flv @ 0212b280] Codec for stream 1 does not use global headers but container format requires global headers Pos: 60.0s 1799f (99%) 0.00fps Trem: 0min 5mb A-V:0.001 [685:95]] Writing index... Video stream: 685.595 kbit/s (85699 B/s) size: 5144242 bytes 60.027 secs 1799 frames Audio stream: 95.995 kbit/s (11999 B/s) size: 726375 bytes 60.534 secs ------------------------------------------------------------------------ As you can see, the audio stream is 95 kbit/s. This is correct and is exactly the same as the original. However, playing with Mplayer - look at the audiodatarate - shows this: Clip info: duration: 61 width: 640 height: 360 videodatarate: 781 framerate: 30 videocodecid: 7 audiodatarate: 3 audiosamplerate: 44100 audiosamplesize: 16 stereo: true audiocodecid: 10 encoder: Lavf53.6.0 filesize: 5951333 Load subtitles in ./ ========================================================================== Opening audio decoder: [ffmpeg] FFmpeg/libavcodec audio decoders AUDIO: 44100 Hz, 2 ch, s16le, 3.4 kbit/0.24% (ratio: 421->176400) Selected audio codec: [ffaac] afm: ffmpeg (FFmpeg AAC (MPEG-2/MPEG-4 Audio)) ========================================================================== The audiodatarate is only showing 3 and 3.4 kbit as shown above. The program MediaInfo confirms this. Any ideas to correct this really appreciated.

1 1

avi h264 to mp4 (without transcoding)
by Phil Sturges 30 Jul '11

30 Jul '11

HI, I have many avi's that are mostly encoded from pal dvd's. They were encoded using ffmpeg, although I don't recall the precise command I used as it was some time ago. I don't think they were de-interlaced during encoding. The video is encoded as h264 with the original ac3 soundtrack. I have been playing them very effectively through xbmc on my HDTV for some time. I would now like to make them iOS compatible by putting them in mp4 containers and adding an aac audio track as the first audio track. I'm trying to avoid having to re-encode so that it can be done quickly and without loss of video quality. I have tried to achieve this with both ffmpeg and also mp4box, but have hit road blocks with both for different reasons. So, I thought now I'd give mencoder a go. So far I have the following command: mencoder video.avi -of lavf -lavfopts format=mp4 -ovc copy -oac faac -faacopts br=160:mpeg=4:object=2:raw -channels 2 -o video.m4v The first problem that I need to solve is that the resulting video plays in various media players including vlc and mplayer, however when played in itunes there is no video and when played on a ipad the player simply crashes with no error message. The second problem is how do add the original sound track as a second sound track? Thanks for any help Phil

3 9

Mencoder not copying aac to mp4
by Renato Zippert 29 Jul '11

29 Jul '11

Good afternoon... I was trying to find a faster/better scriptable way to hardsub some files I have than using avidemux and then ffmpeg, so I'm trying mencoder. The problem is that I don't understand the reason for this error: MEncoder 1.0rc4-4.5.2 (C) 2000-2010 MPlayer Team > > WARNING: OUTPUT FILE FORMAT IS _AVI_. See -of help. > success: format: 0 data: 0x0 - 0x18c93ddd > [mkv] Track ID 1: video (V_MPEG4/ISO/AVC) "Vï¿½deo", -vid 0 > [mkv] Track ID 2: audio (A_AAC) "ï¿½udio", -aid 0, -alang jpn > [mkv] Track ID 3: subtitles (S_TEXT/ASS) "Legenda", -sid 0, -slang por > [mkv] Will play video track 1. > Matroska file format detected. > VIDEO: [avc1] 1280x720 24bpp 23.976 fps 0.0 kbps ( 0.0 kbyte/s) > [V] filefmt:31 fourcc:0x31637661 size:1280x720 fps:23.976 ftime:=0.0417 > Opening video filter: [expand osd=1] > Expand: -1 x -1, -1 ; -1, osd: 1, aspect: 0.000000, round: 1 > Opening video filter: [dsize=640:360:0] > ================================================== ======================== > Opening video decoder: [ffmpeg] FFmpeg's libavcodec codec family > Selected video codec: [ffh264] vfm: ffmpeg (FFmpeg H.264) > ================================================== ======================== > *Audio format 0x4134504d is incompatible with '-oac copy', please try '-oac > pcm' instead or use '-fafmttag' to override it. > * * *Audio mediainfo for source file: Audio > ID : 2 > Format : AAC > Format/Info : Advanced Audio Codec > Format profile : LC > Codec ID : A_AAC > Duration : 23mn 41s > Channel(s) : 2 channels > Channel positions : Front: L R > Sampling rate : 48.0 KHz > Compression mode : Lossy > Title : ï¿½udio > Language : Japanese My command line is: (with or without -lavfopts format=mp4 the result is the same) mencoder -endpos 20 -vf ass -vf dsize=640:360:0 -embeddedfonts -noskip *-oac > copy -ovc lavc -lavfopts format=mp4* -lavcopts > vcodec=mpeg4:vqmin=2:vqmax=5:vbitrate=1000000 file.mkv -o teste.mp4 > If I force an aac reencode it works, how come it can't be copied? Also I don't know how to use the -fafmttag to force aac... OBS: Command line used to test the aac reencode: mencoder -endpos 20 -vf ass -vf dsize=640:360:0 -embeddedfonts -noskip *-oac > faac -faacopts quality=800* -ovc lavc -lavfopts format=mp4 -lavcopts > vcodec=mpeg4:vqmin=2:vqmax=5:vbitrate=1000000 file.mkv -o teste.mp4 > I appreciate your attention. Att, Renato Rodrigues Zippert

2 3

Fresh Build Recommendations, Scripts for Mac OS X and iDevice users
by L. Lee 16 Jul '11

16 Jul '11

I updated some instructions for building MPlayer and MEncoder as well as ffmpeg for Mac OS X Snow Leopard users. I'll be testing with Lion soon, I hope, but I didn't want to wait to update this. I've moved most of my online content because of the retirement of a venerable old server, but I wanted to share the fact that I've overhauled some of my hosted info to include iDevices and such. It's a lot more manageable than before also, the main possible trade-off being that it now requires Snow Leopard exclusively. I didn't include Lame in these instructions, either, but I think a lot of common functionality is provided. I mentioned this before briefly, but imagine, for example, being able to play an iPhone 4 HD movie through the Apple component video adapter into the Hauppauge HD-PVR, then to drop the exported full quality stream file exported from EyeTV onto an AppleScript applet that uses MEncoder to convert it to a video file you can sync to your iPhone, iPad, or iPod Touch using iTunes whenever you like. Now imagine that the quality of the converted file is practically indistinguishable from the original, even when played on an HD screen, complete with the preservation of 24 fps for film titles. https://sites.google.com/site/llee040/Home/hdtv_to_dvd/ Laine Lee

1 0

Audio bitrate Convertion help required.
by Shaan .. 11 Jul '11

11 Jul '11

Hi, I have a 8 GB MKV format movie which I am converting and downsizing to fit and play using my usb dvd-player. I am able to manage downsize video to xvid format with 2 pass. but i noticed audio in that movie is 1510 kb, which is too much for my player to handle. Its playing but hanging after every few secs while playing with this large bitrate. So my aim is to reduce the bitrate without loosing its quality and channel 6. I believe its DTS encoding in original, which i didnt see available with mencoder. I have to watch movie in my home theater 6.2 channel. So quality is a concern, dont want to loose that.. Following is the movie played by mplayer. FYI. E:\avatar>mplayer E:\avatar\cbgb-avatar-ORG.mkv MPlayer dev-SVN-rUNKNOWN-4.2.0 (C) 2000-2007 MPlayer Team CPU: Intel(R) Celeron(R) M processor 1.50GHz (Family: 6, Model: 13, Step ping: 8) CPUflags: MMX: 1 MMX2: 1 3DNow: 0 3DNow2: 0 SSE: 1 SSE2: 1 Compiled with runtime CPU detection. c:/windows/fonts/arial.ttf doesn't look like a bitmap font description, ignoring . Cannot load bitmap font: c:/windows/fonts/arial.ttf Playing E:\avatar\cbgb-avatar-ORG.mkv. [mkv] Track ID 1: video (V_MPEG4/ISO/AVC), -vid 0 [mkv] Track ID 2: audio (A_DTS), -aid 0, -alang eng [mkv] Track ID 3: subtitles (S_TEXT/UTF8), -sid 0, -slang eng [mkv] Will play video track 1. Matroska file format detected. VIDEO: [avc1] 1280x720 24bpp 23.976 fps 0.0 kbps ( 0.0 kbyte/s) ========================================================================== Opening video decoder: [ffmpeg] FFmpeg's libavcodec codec family Selected video codec: [ffh264] vfm: ffmpeg (FFmpeg H.264) ========================================================================== ========================================================================== Opening audio decoder: [libdca] DTS decoding with libdca Stream with high frequencies VQ coding AUDIO: 48000 Hz, 2 ch, s16le, 1536.0 kbit/100.00% (ratio: 192000->192000) Selected audio codec: [dts] afm: libdca (DTS-libdca) ========================================================================== AO: [dsound] 48000Hz 2ch s16le (2 bytes per sample) Starting playback... VDec: vo config request - 1280 x 720 (preferred colorspace: Planar YV12) VDec: using Planar YV12 as output csp (no 0) Movie-Aspect is 1.78:1 - prescaling to correct movie aspect. VO: [directx] 1280x720 => 1280x720 Planar YV12 I am using following command pass-2 to change video and audio. video is fine, need help from audio side. mencoder cbgb-avatar-ORG.mkv -forceidx -vf scale,harddup -zoom -xy 720 -ovc xvid -oac mp3lame -xvidencopts pass=2:bitrate=4000 -channels 6 -ni -o av-18.avi If I use without (-channel 6 ) option its fine. but if i use with channel 6 option its crashing with error: Pos: 73.8s 1612f ( 0%) 11.48fps Trem: 559min 2926mb A-V:-0.088 [1109:271] 1 duplicate frame(s)! Pos: 74.2s 1622f ( 0%) 11.49fps Trem: 560min 2926mb A-V:-0.088 [1105:270] 1 duplicate frame(s)! Pos: 74.7s 1632f ( 0%) 11.50fps Trem: 560min 2921mb A-V:-0.088 [1101:270] 1 duplicate frame(s)! Pos: 75.2s 1642f ( 0%) 11.52fps Trem: 561min 2918mb A-V:-0.088 [1096:270] 1 duplicate frame(s)! Pos: 75.4s 1646f ( 0%) 11.52fps Trem: 561min 2916mb A-V:-0.063 [1094:270] Too many audio packets in the buffer: (4098 in 8245176 bytes). Maybe you are playing a non-interleaved stream/file or the codec failed? For AVI files, try to force non-interleaved mode with the -ni option. Flushing video frames. Writing index... Writing header... ODML: vprp aspect is 16384:9193. Setting audio delay to 0.048s. Video stream: 1093.371 kbit/s (136671 B/s) size: 10311908 bytes 75.450 secs 1646 frames Audio stream: 270.444 kbit/s (33805 B/s) size: 2565432 bytes 75.888 secs Regards, Shaan.

4 4

mencoder //tv capture avi index problem
by ted morris 03 Jul '11

03 Jul '11

greetings, I'm using mencoder to capture live /dev/video[x] streams tv:// with v4l2 and saving them as ffmpeg mpeg4, single pass files, no audio. They playback fine with the media player in Debian linux, and VLC in windows ok. But I want to use VirtualDub and with any version I try I get this warjning: AVI:Index not found or damaged -- reconstructing via file scan. AVI:keyframe flag reconstruction was not specified in option options and the video stream is not a sknown keyframe-only type. Seeking in the video stream may be extremely slow. Note that I have tried both, the fastfreempeg codec for windows for the fourcc FMP4, as well as -forcecc "XVID" with mencoder, to use the XVID codec on windows and the same message appears. So it must be something going on in the header structure of the file :-? I have also played with keyint=<frames> option. Same result. As another test, I tried the xvid codec instead and that did work although the files generated were much larger for similar visual quality (single pass). Although THIS ONE loaded fine in VirtualDub (1.91, 1.8x....). So I must be missing something or there is a bug with avicodec usage. So I am stuck and stumped. Would anyone have any insight into this problem and a way around it? At least for the copious files I have, I read some threads that indicate mencoder itself can rebuild the index (sometimes) but I'm fairly new with mencoder and I can't quite tween out the best way to do that from the on-line doc and man-page. thanks very much in advance! t

4 8

Huffyuv/ffvhuff artifacts
by Eric Wescott 02 Jul '11

02 Jul '11

I'm currently using mplayer/mencoder SVN build 33766 (2011-06-28) and the same date build on ffmpeg. I've tried many other builds over the past year or so and have the same result. You can obtain the two source clips I use to demo the issue here https://pantherfile.uwm.edu/wescott/public/Tape047-0115.m2t https://pantherfile.uwm.edu/wescott/public/Tape047-0116.m2t Basically, I have a ton (70hours or so) of footage I'm using mencoder to perform a inverse telecine on. Then I'm taking this footage and transcoding to ProRes 422HQ for optimal performance in my NLE and composting software. Anyway, here is the method I've used FFVHuffy: mencoder Tape047-0115.m2t -fps 30000/1001 -vf pullup,softskip,harddup,scale=1920:1080 -ofps 24000/1001 -ovc lavc -lavcopts vcodec=ffvhuff:aspect=16/9 -demuxer lavf -oac pcm -o Tape047-0115-FFVHUFF.avi Huffyuv: mencoder Tape047-0115.m2t -fps 30000/1001 -vf pullup,softskip,harddup,scale=1920:1080 -ofps 24000/1001 -ovc lavc -lavcopts vcodec=huffyuv:pred=2:format=422P:vstrict=-1 -demuxer lavf -oac pcm -o Tape047-0115-HUFFYUV.avi Most of the files appear to be correct but maybe 5-10% of them have strange noise issues. The links above are two such examples. The strange thing is sometimes both produce the noise and sometimes it's just one or the other. Any idea what's causing this issue and how I can resolve it? Thanks Eric Wescott

2 1