October 2006 - MPlayer-advusers - lists.mplayerhq.hu

libmp3/ffmp3/libmad bugs...
by RC 15 Nov '06

15 Nov '06

I've uploaded a couple 10sec clips. Longstanding regressions. Both encoded by mencoder years ago... libmp3-bug.avi: libmp3: Blip at beginning. plays fast. Incorrect srate. ffmp3: Blip. No audio. libmad: Plays correctly (but cuts off last ~1 second). ffmp3+lavf: Plays but still blips. libmp3-mad-bug.avi libmp3: Blip. Plays fast. Incorrect srate. ffmp3: Blip. No audio. libmad: Blip. Plays fast. Incorrect srate. mp3acm: Plays correctly ffmp3+lavf: Plays but still blips. libmad+lavf: Plays correctly. (cuts off last second) Both samples play fine with ANY codec when dumped to MP3 files. IMHO, native MP3 decoding is in a pretty sad state.

3 5

mkv demuxer bug: no stream recognized
by Attila Kinali 07 Nov '06

07 Nov '06

Moin, I just stumbled over a bug in the mkv demuxer of MPlayer: MPlayer is unable to detect any streams within the file: ---schnipp--- $ mplayer mkv_no_stream_found.mkv -v MPlayer dev-SVN-r19650-4.1.2 (C) 2000-2006 MPlayer Team [...] Playing mkv_no_stream_found.mkv. get_path('sub/') -> '/home/attila/.mplayer/sub/' [file] File size is 4194304 bytes STREAM: [file] mkv_no_stream_found.mkv STREAM: Description: File STREAM: Author: Albeu STREAM: Comment: based on the code from ??? (probably Arpi) Checking for YUV4MPEG2 ASF_check: not ASF guid! Checking for NuppelVideo Checking for REAL Checking for SMJPEG [mkv] Found the head... [mkv] + a segment... [mkv] |+ segment information... [mkv] | + duration: 1434.852s [mkv] /---- [ parsing seek head ] --------- [mkv] \---- [ parsing seek head ] --------- [mkv] No video track found/wanted. Matroska file format detected. vo: x11 uninit called but X11 not inited.. Exiting... (End of file) ---schnapp--- Although mkvinfo shows them: ---schnipp--- mkvinfo mkv_no_stream_found.mkv + EBML head |+ Doc type: matroska |+ Doc type version: 1 |+ Doc type read version: 1 + Segment, size 149185974 |+ Segment information | + Muxing application: libebml-0.7.5 & libmatroska-0.7.7 | + Writing application: VirtualDubMod 1.5.10.2 (build 2540/release) | + Segment UID: 0xe6 0xb4 0x73 0xda 0x94 0x25 0xca 0x12 0x59 0x52 0x2d 0xa9 0x68 0xa9 0xb4 0x54 | + Duration: 1434.852s (00:23:54.852000000) | + Date: Tue May 23 19:03:56 2006 UTC |+ Seek head (subentries will be skipped) |+ EbmlVoid (size: 2872) |+ Segment tracks | + A track | + Track number: 1 | + Track UID: 3665016038 | + Track type: video | + Lacing flag: 0 | + MinCache: 1 | + Codec ID: V_MS/VFW/FOURCC | + CodecPrivate, length 40 (FourCC: H264, 0x34363248) | + Default duration: 41.708ms (23.976 fps for a video track) | + Video track | + Pixel width: 640 | + Pixel height: 360 | + Display width: 640 | + Display height: 360 | + A track | + Track number: 2 | + Track UID: 315237780 | + Track type: audio | + Codec ID: A_MPEG/L3 | + Audio track | + Sampling frequency: 48000.000000 | + Channels: 2 |+ Cluster ---schnapp--- 4MB sample uploaded to incoming as mkv_no_stream_found.(mkv|txt) Attila Kinali -- egp ist vergleichbar mit einem ikea bausatz fuer flugzeugtraeger -- reeler in +kaosu

2 1

Weird slow decoding problems of DVDs on Mac OS X 10.3.9
by Ergzay 31 Oct '06

31 Oct '06

I have gcc 3.3, ld cctools-525.obj~1, and make 3.79 all runnning on Mac OS X 10.3.9 on a 1.2 Ghz iBook G4. 1.2 Ghz G4 should be plenty to decode a DVD but for some strange reason I am getting frames dropped at a rate of several frames every second or so. Often more if its high action. If its still motion I still get frame dropping although not as much. I am not quite sure what is wrong. I'm not quite sure what info to supply, please tell me what other info I can supply if needed. (If I don't use -profile sub I've found I drop less frames but still drop some.) I did not have these problems in the past but it has been a long while since the last time I played a dvd using mplayer (several months). ~Ergzay alias mp='mplayer' Command used: mp dvd://1 -profile sub -alang ja ~/.mplayer/config fs=on framedrop=on softvol-max=300 [sub] ass=on embeddedfonts=on sid=0 ass-font-scale=0.75 output: MPlayer dev-SVN-r20440-3.3 (C) 2000-2006 MPlayer Team AltiVec found CPU: PowerPC Playing dvd://1. There are 9 titles on this DVD. There are 7 chapters in this DVD title. There are 1 angles in this DVD title. audio stream: 0 format: ac3 (5.1) language: en aid: 128. audio stream: 1 format: ac3 (stereo) language: ja aid: 129. number of audio channels on disk: 2. subtitle ( sid ): 0 language: en subtitle ( sid ): 1 language: en number of subtitles on disk: 2 Selected DVD audio channel: 129 language: ja MPEG-PS file format detected. VIDEO: MPEG2 720x480 (aspect 2) 29.970 fps 8900.0 kbps (1112.5 kbyte/s) Opening video filter: [scale] [ass] auto-open [ass] Init ======================================================================== == Opening video decoder: [mpegpes] MPEG 1/2 Video passthrough VDec: vo config request - 720 x 480 (preferred colorspace: 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. Try adding the scale filter, e.g. -vf spp,scale instead of -vf spp. 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)) ======================================================================== == ======================================================================== == Opening audio decoder: [liba52] AC3 decoding with liba52 Using AltiVec optimized IMDCT transform Checking for AltiVec resampler : 0x00000002, 2 Using AltiVec optimized resampler AUDIO: 48000 Hz, 2 ch, s16be, 224.0 kbit/14.58% (ratio: 28000->192000) Selected audio codec: [a52] afm: liba52 (AC3-liba52) ======================================================================== == AO: [macosx] 48000Hz 2ch s16be (2 bytes per sample) Starting playback... VDec: vo config request - 720 x 480 (preferred colorspace: Planar YV12) VDec: using Planar YV12 as output csp (no 0) Movie-Aspect is 1.33:1 - prescaling to correct movie aspect. SwScaler: using unscaled yuv420p -> yuyv422 special converter VO: [macosx] 720x480 => 720x540 Packed YUY2 [fs]

4 4

[BUG] mencoder Floating point exception
by Giacomo Comes 30 Oct '06

30 Oct '06

A recent change in libavcodec/mpegvideo.c (r 6565) makes mencoder crash with Floating point exception when an mpeg with bframes is made. Some command line examples: http://lists.mplayerhq.hu/pipermail/mplayer-users/2006-October/063454.html http://lists.mplayerhq.hu/pipermail/mplayer-users/2006-October/063428.html Reverting the changes done in r 6565 "fix" the bug. The code was submitted by Michael Niedermayer (I think). Giacomo

2 1

terminology misunderstanding: pulldown vs telecine
by Andrew Savchenko 24 Oct '06

24 Oct '06

Hello all! I can't clarify difference between "pulldown" and "telecine" concepts currently. I'm in the middle of translation of encoding-guide.xml (into Russian), where the problem of distinguishing this terms was encountered. So, I'm relying on your help. Sorry if it is wrong mail list, but previously I was edified that adv-users is more acceptable place for questions which not clearly belongs to the other topics and which are not users meanwhile. I haven't send this to documentation or translation ML, 'cause it seems to be not a question about documentation improvement, but rather about my misunderstanding of some points in it. It is the first extract from encoding-guide.xml: --- Whenever a movie is prepared for display on television (including DVD), it is converted to a field-based format. The various methods by which this can be done are collectively referred to as "pulldown", of which the infamous NTSC "3:2 telecine" is one variety. --- From this I can conclude that telecine technique is a subset of pulldown methods. But further in the text there is an opposite statement: --- Because NTSC is 30000/1001 fps, some processing must be done to this 24 fps video to make it run at the correct NTSC framerate. The process is called 3:2 pulldown, commonly referred to as telecine (because pulldown is often applied during the telecine process), and, naively described, it works by slowing the film down to 24000/1001 fps, and repeating every fourth frame. --- Still here I'm bit confused. In the first statement pulldown is a common name for telecine methods, and the telecine seems as subset of the pulldown. In the second statement it is almost vice versa. Are they (telecine and pulldown terms) synonyms? If they are why they are used in different ways across documentation? If they aren't then either it is a typo, or I completely misunderstood something. Of cause, I also looked up via wikipedia (http://en.wikipedia.org/wiki/Telecine and http://en.wikipedia.org/wiki/Pulldown) but similar unclearness is there: pulldown is refered as a part of telecine technique but telecine is refered to pulldown 8-/. And there is another trouble dependent on previous. How to understand this: --- On the other hand, TV series are usually only interlaced, not telecined. -- ?? Of cause, telecined video is a video in field-based format, that's why it is interlaced (and not progressive) by definition. But how video can be interlaced and not telecined simultaneously? From the context of previous text (in encoding-guide.xml) I can conclude that this sentece is about video being interlaced without framerate change, IOW each frame was just transformed into two field with odd and even lines alternately. Am I right? But if telecine and pulldown refers to the same process, the last quotation seems to be senceless, since pulldown is always applied in order to make interlaced video from progressive. Please, explain me clearly these incomprehensible concepts and difference between them. Thanks for your help.

4 4

[BUGREPORT] twolame crash
by RC 04 Oct '06

04 Oct '06

This is a sneaky bug... Twolame works on it's own, but when both it and toolame are compiled-in, -oac toolame works, while -oac twolame instantly segfaults. I've been seeing it since twolame support was added. Obviously a low priority. gdb output attached.

2 2

-llavcopts vcodec=flv1 -o done.avi gives wrong fourcc
by compn 04 Oct '06

04 Oct '06

it uses 'flv' for the fourcc codecs.conf has FLV1 as the fourcc for ffflv so either: add fourcc flv,FLV,flv1 to the videocodec ffflv in codecs.conf or fix mencoder fourcc output of vcodec=flv1 -compn

1 0