May 2011 - ffmpeg-user - lists.ffmpeg.org

changing GOP size
by nandan.amar＠gmail.com 15 Sep '11

15 Sep '11

dear one, can we change the gop size of mpeg/h264 video while encoding using ffmpeg... if yes, please share the required option with ffmpeg.

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milliseconds to mpeg-ts pts/dts
by steuer＠unixsystems.de 07 Sep '11

07 Sep '11

guys, i try to create an mpegts file from H.264 and ACC raw frames that i receive from a network connection. I create AVPacket structures, set data, size, pts and dts etc. manually. For the stream that I receive, PTS and DTS seem to be equal, so I just calculate the packet pts and dts with incoming pts / 1000.0 * 90000.0 I do that for audio and video. Unfortunately that seems to be wrong as ffmpeg states "dts < pcr, TS is invalid" after a couple of seconds. I seems that the timestamps run out of sync with the internal pcr reference clock. What would be the correct way to calculate the pts and dts of the mpegts stream? Thanks alot for your help! Cheers, Heri

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DNxHD / MOV: what is the extra data in stsd?
by Thomas Worth 22 Aug '11

22 Aug '11

I noticed that encoding a DNxHD encoded MOV with FFmpeg results in some extra data in the stsd atom for the video track. This data isn't there after encoding to other codecs, say Apple Animation/qtrle for example. At its most basic structure, stsd is 102 bytes, but with DNxHD material is is I think 275 bytes. Furthermore, this data is apparently needed to render the video correctly, because if I truncate stsd to 102, the resulting video is black in the QuickTime player (it still plays in VLC, though). This is some of what I'm seeing (as text): ACLRACLR0001 APRGAPRG0001 ARESARES0001 What is this data and what is referencing it? I have some additional stsd parameters I need to insert, but I don't know if putting stuff in before the "DNxHD extra data" (what we'll call it) will confuse whatever is looking for this extra data. Baptiste?

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Hint tracks support for MP4
by stas.oskin＠gmail.com 16 Aug '11

16 Aug '11

Hi. Any idea if FFMPEG supports / will be supporting adding hint tracks to MP4 files for RTSP streaming? Regards.

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Using video card chipset to encode.
by drgkill＠gmail.com 10 Aug '11

10 Aug '11

Dear FFmpeg team, Your soft is really great, I use it every day, but with the announcement of Badabom from Nvidia, I was asking myself if FFmpeg will handle the GPU to encode videos. They are announcing (Nvidia, AMD) 2x real time encoding rates (for more details, codec, video size, etc, see : http://www.youtube.com/watch?v=8C_Pj1Ep4nw) It's about 6 to 10 time faster than with my Xeon quad core. So I was wondering if FFmeg plan to implement that kind of code. Thanks by advance. Guillaume S.

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ffmpeg -map guru required
by david＠davidfavor.com 28 Jul '11

28 Jul '11

File to remap is: FFmpeg version 0.6.1, Copyright (c) 2000-2010 the FFmpeg developers built on Oct 25 2010 08:06:34 with gcc 4.2.1 (Apple Inc. build 5664) configuration: --prefix=/opt/local --enable-gpl --enable-postproc --enable-swscale --enable-avfilter --enable-avfilter-lavf --enable-libmp3lame --enable-libvorbis --enable-libtheora --enable-libdirac --enable-libschroedinger --enable-libfaac --enable-libfaad --enable-libxvid --enable-libx264 --enable-libvpx --enable-libspeex --enable-nonfree --mandir=/opt/local/share/man --enable-shared --enable-pthreads --disable-indevs --cc=/usr/bin/gcc-4.2 --arch=x86_64 libavutil 50.15. 1 / 50.15. 1 libavcodec 52.72. 2 / 52.72. 2 libavformat 52.64. 2 / 52.64. 2 libavdevice 52. 2. 0 / 52. 2. 0 libavfilter 1.19. 0 / 1.19. 0 libswscale 1.11. 0 / 1.11. 0 libpostproc 51. 2. 0 / 51. 2. 0 [mov,mp4,m4a,3gp,3g2,mj2 @ 0x12180c800]multiple edit list entries, a/v desync might occur, patch welcome Seems stream 2 codec frame rate differs from container frame rate: 2000.00 (2000/1) -> 45.33 (136/3) Seems stream 3 codec frame rate differs from container frame rate: 2000.00 (2000/1) -> 45.33 (136/3) Last message repeated 1 times Input #0, mov,mp4,m4a,3gp,3g2,mj2, from '2011-02-09-rap-melissa-cantrelle.mov': Metadata: major_brand : qt minor_version : 537199360 compatible_brands: qt Duration: 01:09:51.85, start: 0.000000, bitrate: 1293 kb/s Stream #0.0(eng): Audio: aac, 44100 Hz, mono, s16, 65 kb/s Stream #0.1(eng): Audio: aac, 44100 Hz, stereo, s16, 98 kb/s Stream #0.2(eng): Video: h264, yuv420p, 640x480, 390 kb/s, 15.06 fps, 45.33 tbr, 1k tbn, 2k tbc Stream #0.3(eng): Video: h264, yuv420p, 640x480, 705 kb/s, 15.06 fps, 45.33 tbr, 1k tbn, 2k tbc This works: ffmpeg -y -i 2011-02-09.mov -vcodec copy -acodec copy \ -map 0.2 -map 0.0 foo.mov This fails: ffmpeg -y -i 2011-02-09.mov -vcodec copy -acodec copy \ -map 0.2 -map 0.3 -map 0.0 foo.mov ... ... ... Number of stream maps must match number of output streams My goal is to copy 0.0 + 0.2 + 0.3 into an output file, dropping 0.1 turning copy. Suggestions appreciated. Thanks. -- Love feeling your best ever, all day, every day? Click http://RadicalHealth.com for the easy way!

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Force first frame to be full, non blurred I frame
by Sergey Kurdakov 15 Jul '11

15 Jul '11

Hi, I develop silverlight application which can play h264 files which I produce with ffmpeg from recorded avi s, still, due to used underlying MediaElement ( which I would prefer not to force to move to some better pos for still image ) the first (still) frame shows blurry, I found that it is possible to set force_key_frames and I do following ffmpeg -i input.avi -an -vcodec libx264 -vpre veryslow -r 30 -b 400k -force_key_frames 0 -threads 0 OUTPUT.mp4 (actually two passes ffmpeg -i input.avi -an -pass 1 -vcodec libx264 -vpre veryslow_firstpass -r 30 -b 400k -force_key_frames 0 -threads 0 OUTPUT.mp4 ffmpeg -i input.avi -an -pass 2 -vcodec libx264 -vpre veryslow -r 30 -b 400k -force_key_frames 0 -threads 0 OUTPUT.mp4 ) but still I get blurry first frame (-force_key_frames -1 also does not give needed result ) , so the question is - which number (time) to set to -force_key_frames ( or set some other param ) so that first frame ( or first frames ) was non blurry I-frame ( otherwise video quality is excellent - but exactly the first frame is really blurry. Some hints - opening resulting video in avidemux shows that the first frame in sequence is B frame then followed by P frame and then 3rd frame is my first blurry I frame - though avidemux might be wrong, still it could indicate a problem that B frame affects what I get as resulting I frame). Regards Sergey

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undefined reference to 'ff_find_pix_fmt'
by bryandonnovan＠gmail.com 13 Jul '11

13 Jul '11

building 0.6.9-rc0 for win32 with a configuration for writing FLV files... When libavformat links, it has an unresolved external 'ff_find_pix_fmt' ff_find_pix_fmt is defined in avcodec/raw.h and avcodec/rawdec.c however it does not appear in avcodec/avcodec-52.def So, my main question is -- what change must I make so that it DOES appear in the DEF file? My second question is the error "./configure: line 761: pkg-config: command not found" -- is this a problem? And if so, what can I do about it? Thanks Ouput from configure and link stages below: ./configure: line 761: pkg-config: command not found install prefix /usr/local source path /C/ffmpeg-0.6.90-rc0 C compiler gcc ARCH x86 (generic) big-endian no runtime cpu detection yes yasm yes MMX enabled yes MMX2 enabled yes 3DNow! enabled yes 3DNow! extended enabled yes SSE enabled yes SSSE3 enabled yes CMOV enabled no CMOV is fast no EBX available yes EBP available no 10 operands supported yes debug symbols no strip symbols yes optimizations yes static yes shared yes postprocessing support no new filter support no network support no threading support w32threads SDL support no Sun medialib support no AVISynth enabled no frei0r enabled no libdc1394 support no libdirac enabled no libfaac enabled no libgsm enabled no libmp3lame enabled yes libnut enabled no libopencore-amrnb support no libopencore-amrwb support no libopencv support no libopenjpeg enabled no librtmp enabled no libschroedinger enabled no libspeex enabled no libtheora enabled no libvorbis enabled no libvpx enabled no libx264 enabled no libxavs enabled no libxvid enabled no zlib enabled no bzlib enabled no Enabled decoders: Enabled encoders: flv h263 libmp3lame Enabled hwaccels: Enabled parsers: Enabled demuxers: Enabled muxers: flv mp3 Enabled protocols: file Enabled filters: Enabled bsfs: mp3_header_compress Enabled indevs: Enabled outdevs: License: LGPL version 2.1 or later Creating config.mak and config.h... libavutil/avconfig.h is unchanged Creating library file: libavutil/libavutil.dll.a lib.exe /machine:i386 /def:libavutil/avutil-50.def /out:libavutil/avutil-50.lib Microsoft (R) Library Manager Version 10.00.30319.01 Copyright (C) Microsoft Corporation. All rights reserved. Creating library libavutil/avutil-50.lib and object libavutil/avutil-50.exp LD libavcodec/avcodec-52.dll Creating library file: libavcodec/libavcodec.dll.a lib.exe /machine:i386 /def:libavcodec/avcodec-52.def /out:libavcodec/avcodec-52.lib Microsoft (R) Library Manager Version 10.00.30319.01 Copyright (C) Microsoft Corporation. All rights reserved. Creating library libavcodec/avcodec-52.lib and object libavcodec/avcodec-52.exp LD libavformat/avformat-52.dll Creating library file: libavformat/libavformat.dll.a libavformat/utils.o:utils.c:(.text+0x9293): undefined reference to `ff_find_pix_fmt' collect2: ld returned 1 exit status make: *** [libavformat/avformat-52.dll] Error 1

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Piping trough Avisynth
by bouke＠editb.nl 25 Jun '11

25 Jun '11

Workin on PNG overlay trough Avisynth, and have MXF as a source and target file. Now i haven't found a proper MXF importer, so i'm rendering an (uncompressed) AVI inbetween file to feed Avisynth. This is kinda silly of course, there must be a way to pipe. But the question is, how? Bouke

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Unable to link my code with FFmpeg
by varundua007＠gmail.com 23 Jun '11

23 Jun '11

Hi All, I have build ffmpeg on windows using msys and mingw. I have written a small piece of code in C to convert a movie file to images. The file compiles well but it shows linking problem (I assume they are linking problems). I run my program using the following command gcc -Wall -I/local/include -L/local/lib test4.c when I use the -c option, test4.o file is created, but it gives problems when I remove the -c option. Please help me with this error C:\Users\varund\AppData\Local\Temp\ccw1tHZ5.o:test4.c:(.text+0xea): undefined reference to `avpicture_get_size' C:\Users\varund\AppData\Local\Temp\ccw1tHZ5.o:test4.c:(.text+0x12a): undefined reference to `avcodec_alloc_context' C:\Users\varund\AppData\Local\Temp\ccw1tHZ5.o:test4.c:(.text+0x1b8): undefined reference to `avcodec_find_encoder' C:\Users\varund\AppData\Local\Temp\ccw1tHZ5.o:test4.c:(.text+0x1e8): undefined reference to `avcodec_open' C:\Users\varund\AppData\Local\Temp\ccw1tHZ5.o:test4.c:(.text+0x241): undefined reference to `avcodec_encode_video' C:\Users\varund\AppData\Local\Temp\ccw1tHZ5.o:test4.c:(.text+0x2b1): undefined reference to `avcodec_close' C:\Users\varund\AppData\Local\Temp\ccw1tHZ5.o:test4.c:(.text+0x2f0): undefined reference to `avpicture_get_size' C:\Users\varund\AppData\Local\Temp\ccw1tHZ5.o:test4.c:(.text+0x330): undefined reference to `avcodec_alloc_context' C:\Users\varund\AppData\Local\Temp\ccw1tHZ5.o:test4.c:(.text+0x3b8): undefined reference to `avcodec_find_encoder' C:\Users\varund\AppData\Local\Temp\ccw1tHZ5.o:test4.c:(.text+0x3e8): undefined reference to `avcodec_open' C:\Users\varund\AppData\Local\Temp\ccw1tHZ5.o:test4.c:(.text+0x441): undefined reference to `avcodec_encode_video' C:\Users\varund\AppData\Local\Temp\ccw1tHZ5.o:test4.c:(.text+0x4b1): undefined reference to `avcodec_close' ................. ............... collect2: ld returned 1 exit status Thanks Varun Dua

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