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

Re: [FFmpeg-user] Differences downloading RA files with FFMpeg and mplayer
by bat guano 21 May '11

21 May '11

Dear all, I have noted some differences downloading ra files (via rtsp) using FFMpeg and mplayer, for example: fmpeg -i rtsp://mm6.rai.it/radiofonia/radio3/napoli/cuoreditenebra/2011/cuoreditenebra2011_03_26.ra output1.ra mplayer rtsp://mm6.rai.it/radiofonia/radio3/napoli/cuoreditenebra/2011/cuoreditenebra2011_03_26.ra -dumpstream if I listen the resulting files with FFPlay, they seems to be the same audio stream, but, if I open them with media player cassic (Real Alternative codecs), the file downloaded with FFMpeg have a bad quality. Someone knows the reason? Maybe, seeking problems, I think, but I am not sure. I use Windows XP, but I don't think it is the reason. Thanks Sandro ********************************************** Hi Sandro When you download with FFmpeg with command:- ffmpeg -i rtsp://mm6.rai.it/radiofonia/radio3/napoli/cuoreditenebra/2011/cuoreditenebra2011_03_26.ra output1.ra you are re-encoding the file. That's why the quality is poor. When you download with mPlayer using command:- mplayer rtsp://mm6.rai.it/radiofonia/radio3/napoli/cuoreditenebra/2011/cuoreditenebra2011_03_26.ra -dumpstream you are dumping the file without re-encoding. The quality is the same as original. So FFmpeg is not a good choice for this job. mPlayer is best in this case. Especially if you use '-bandwidth 999999'. Like this:- mplayer -bandwidth 999999 rtsp://mm6.rai.it/radiofonia/radio3/napoli/cuoreditenebra/2011/cuoreditenebra2011_03_26.ra -dumpstream -dumpfile cuoreditenebra2011_03_26.ra By using '-bandwidth 999999' the 50 minute show is downloaded in less than 2 minutes! Here is the result:- http://www.mediafire.com/?8rqr1y8bkjj5e59 I don't understand Italian, but in this show they have been talking about Led Zeppelin!

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mpeg-ts to mkv without sound delay
by Peter Bašista 21 May '11

21 May '11

> Hi everyone, > > I wood like to change the container of some videos I record with my TV, and > compress it for archiving purpose. > The container is mpeg-ts, the video codec is h264 and the audio one is mp2. > I wood like mkv, h264, aac. I also want the video stream to be more > compress. We seem to have similar goals :) > So the first step is to change the container, I try : > > ffmpeg -i test.ts -vcodec copy -acodec copy movie.mkv > > The process run normally except this message : > > [NULL @ 0x645bb0]missing picture in access unit > > The output file is fine but there is a delay between sound and video. Can you be more specific? If I do the same thing with my captured mpeg-ts file, I have no delay at all. Only for the first a few seconds after the playback starts, there is an audio delay, but it is continuously fading away and after about 10 seconds, everything is in sync. A piece from mplayer's status line: A: 1.9 V: 3.4 A-V: -1.534 That is, I suppose, mplayer's issue. It is just not able to sync audio and video from this file immediately after the start of the playback. But then it all plays in sync. I don't think the reason is that the audio and video are not synchronized in the resulting file. > So my questions are : > > 1. How to avoid this delay ? Explain in more detail what kind of delay you experience. > 2. How to compress more the video stream ? Maybe try with a > different bitrate ? Is there a way to automatically choose a suitable > bitrate? I do not have any bright ideas about that. However, since the source is h264, I would try very hard to avoid reencoding, unless it is absolutely necessary. I don't know how much you care about the resulting file size, but I doubt that you can achieve significant file size reduction (say, 50%) while maintaining the video quality. On the other hand, I may be wrong. I am no expert in this field. Another question is whether it is worth to reencode the video if you know that it will reduce its size only by, say 20%. Would you sitll want to do it? Most of the time, I would not. > 3. To change the audio codec -acodec aac will be ok ? This will only work if you add -strict experimental to your command line. I do not have any experience with that, but you can also use the non experimental codec libfaac. Peter Basista

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Deinterlace and change framerate with -vcodec copy
by Peter Bašista 21 May '11

21 May '11

I am sorry for the previous post. I did not know why, but Hotmail just mercilessly discards all my newlines. I will try to repost correctly. Peter Basista

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mpeg-ts to mkv without sound delay
by Armel Bourgon-Drouot 21 May '11

21 May '11

Hi everyone, I wood like to change the container of some videos I record with my TV, and compress it for archiving purpose. The container is mpeg-ts, the video codec is h264 and the audio one is mp2. I wood like mkv, h264, aac. I also want the video stream to be more compress. Here is the result of ffpeg -i test.ts : Input #0, mpegts, from 'test.ts': Duration: 01:55:45.60, start: 1.400000, bitrate: 5050 kb/s Program 1 Service01 Metadata: name : Service01 provider_name : FFmpeg Stream #0.0[0x100]: Video: h264, yuv420p, 1440x1080 [PAR 4:3 DAR 16:9], 25 fps, 25 tbr, 90k tbn, 50 tbc Stream #0.1[0x101](fre): Audio: mp2, 48000 Hz, 2 channels, s16, 64 kb/s At least one output file must be specified File size : 4.1 GB So the first step is to change the container, I try : ffmpeg -i test.ts -vcodec copy -acodec copy movie.mkv The process run normally except this message : [NULL @ 0x645bb0]missing picture in access unit The output file is fine but there is a delay between sound and video. So my questions are : 1. How to avoid this delay ? 2. How to compress more the video stream ? Maybe try with a different bitrate ? Is there a way to automatically choose a suitable bitrate? 3. To change the audio codec -acodec aac will be ok ? Thank you for your time -- Armel

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Error extracting images from .mov with timecode
by Dario 20 May '11

20 May '11

Hi, We have a .mov file which has a timecode track in it, which seems to be causing ffmpeg lots of fits when extracting jpegs out of it. I'm using the latest windows binary found on http://ffmpeg.zeranoe.com/builds/ I first tried extracting the jpegs out like this: ffmpeg.exe -i inputmovie.mov -y Output\Image%06d.jpg When running the above, I get the first frame of video duplicated about 2700 times, then I get *948* frames of the actual video. So, I then ran ffprobe.exe to extract the timecode information out of the video: Here is the output from ffprobe.exe: Unsupported codec with id 0 for input stream 2 [STREAM] index=0 codec_name=pcm_s16be codec_long_name=PCM signed 16-bit big-endian codec_type=audio codec_time_base=0/1 codec_tag_string=twos codec_tag=0x736f7774 sample_rate=48000.000000 channels=2 bits_per_sample=16 r_frame_rate=0/0 avg_frame_rate=7575/158 time_base=1/48000 start_time=0.000000 duration=39.528333 nb_frames=1897360 TAG:creation_time=2011-05-03 20:16:26 TAG:language=eng [/STREAM] [STREAM] index=1 codec_name=mjpeg codec_long_name=MJPEG (Motion JPEG) codec_type=video codec_time_base=1/23976 codec_tag_string=jpeg codec_tag=0x6765706a width=960 height=540 has_b_frames=0 sample_aspect_ratio=72:72 display_aspect_ratio=16:9 pix_fmt=yuvj420p r_frame_rate=2997/125 avg_frame_rate=2997/125 time_base=1/23976 start_time=-0.003003 duration=39.539540 nb_frames=948 TAG:creation_time=2011-05-03 20:16:26 TAG:language=eng [/STREAM] [STREAM] index=2 codec_name=unknown codec_type=data codec_time_base=0/1 codec_tag_string=tmcd codec_tag=0x64636d74 r_frame_rate=0/0 avg_frame_rate=0/0 time_base=1/600 start_time=-108.695000 duration=162.286667 nb_frames=1 TAG:creation_time=2011-05-03 20:16:26 TAG:language=eng [/STREAM] As you can see there are *948* frames in the video (as is confirmed by Quicktime). In addition, the start_time in the timecode stream is -108.695000. So, I then tried to pass the timecode start_time value as the -ss value like so: ffmpeg.exe -i inputmovie.mov -ss 108.695 -y Output\Image%06d.jpg However, this only extracts *947* jpegs. I also tried passing the duration as the -t value, but it didn't help. I am stuck either getting tons of duplicate images or getting one frame less than the number of frames in the video. I also tried the -vcodec copy option instead of specifying the -ss option, which worked wonderfully and extracted 948 frames, except that it only seems to work on motion jpegs and no other codecs... my utility needs to work on any type of codec ffmpeg supports. So, I'm stuck. I'm wondering if this is a bug or if I'm just using ffmpeg improperly. Any help would be appreciated. Thanks, Dario

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libavfilter movie overlay
by Anders Gunnarsson 20 May '11

20 May '11

Hi I'm trying to overlay a movie with another movie using the -vf movie and overlay filter. I'm trying the examples at http://www.ffmpeg.org/libavfilter.html#SEC51 But getting the error [movie @ 0x2ed6190] init() expected 3 arguments:'full.mp4' Error initializing filter 'movie' with args 'full.mp4' I've tried adding all [:options] to the movie command, but I'm getting the same error. This is using the libavfilter-SoC version. I've tried with the original ffmpeg too, were it also fails, only with no error messages. Have anybody gotten this to work? regards Anders

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Re: [FFmpeg-user] Meet problem when cross compiler(using powerpc-linux-gnu-gcc ) FFMPEG source code
by Andrey m0shbear Vul 20 May '11

20 May '11

From: 小羊 <oceantear(a)gmail.com> Hi All, I am a newbie for using FFMPEG lib to develop a tool. Firstly, i downloaded the source code from git server and tried to cross compiler(powerpc-linux-gnu-gcc ) the source code on my LINUX server. Unfortunately, it is not smooth. My compiler environment: OS: Ubuntu 11.04 VMWare: 7.0 My configuration: ./configure --enable-cross-compile --arch=powerpc --host-cc=powerpc-linux-gnu-gcc --target-os=linux Error Message: You need a compiler that supports {} in AltiVec vector declarations Can someone give me some suggestion? Thanks in advance. _______________________________________________ gcc version?

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Meet problem when cross compiler(using powerpc-linux-gnu-gcc ) FFMPEG source code
by 小羊 20 May '11

20 May '11

Hi All, I am a newbie for using FFMPEG lib to develop a tool. Firstly, i downloaded the source code from git server and tried to cross compiler(powerpc-linux-gnu-gcc ) the source code on my LINUX server. Unfortunately, it is not smooth. My compiler environment: OS: Ubuntu 11.04 VMWare: 7.0 My configuration: ./configure --enable-cross-compile --arch=powerpc --host-cc=powerpc-linux-gnu-gcc --target-os=linux Error Message: You need a compiler that supports {} in AltiVec vector declarations Can someone give me some suggestion? Thanks in advance.

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Number of frames decreased
by Gavino L. Maddau 19 May '11

19 May '11

Hi everyone! When i try to encode a yv12 file into a compressed one (i'm using mpeg1video, mpeg2video and x264), the number of frames of the encoded file is smaller than that of the original one. In fact, the number of frames of the yv12 file is 29, the other one is 27, whichever coder i use. Usually i write, in the mpeg1 case: ffmpeg -s qcif -pix_fmt yuv420p -i in.yuv -vcodec mpeg1video -f mpeg out.mpg I also tried to set the input and output framerate, the number of frames to code (-vframes 29), the output bit rate (-b), the buffer size and the maximum bit rate, but nothing changed. I have to calculate the psnr between the original video and the encoded one, but if the number of frames is different, i can't know which frame in the original file originate a coded one, because there's not a one-to-one correspondence. How can i solve this problem? Thank you. Sorry for my bad english.

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I try to compile VLC, I had a error message about ffmpeg.
by Park, Tim 19 May '11

19 May '11

I try to compile VLC for ios source with iphoneos4.3. So, I took recent sources in the web site vlc.org today. And I compiled build_for_iOS.sh. But I failed to compile it successfully. I had a error message about ffmpeg. How can I do? please, help me. feelingkyi-macbook:ios feelingk$ sudo ./build_for_iOS.sh -k iphoneos4.3 Password: Building libvlc for the iOS /Project/vlc/vlc-new_2/VLC-1.1.0-iOS /Project/vlc/vlc-new_2/VLC-1.1.0-iOS/extras/package/ios /Project/vlc/vlc-new_2/VLC-1.1.0-iOS/extras/package/ios Boostraping contribs /Project/vlc/vlc-new_2/VLC-1.1.0-iOS/extras/contrib /Project/vlc/vlc-new_2/VLC-1.1.0-iOS/extras/package/ios Building contrib for iOS Forcing distro.mak to use ios.mak ***************************************************************** * If you need contribs with all debug information, run this * * line and compile the libraries on your own. * * CONTRIBS_RELEASE=no ./bootstrap * ***************************************************************** Using 1 processors cp config.mak src-arm-apple-darwin10-ios/src/../config.mak ln -sf ../../src/Patches src-arm-apple-darwin10-ios/src ln -sf ../../src/packages.mak src-arm-apple-darwin10-ios/src ln -sf ../../src/Makefile src-arm-apple-darwin10-ios/src/Makefile make -C src-arm-apple-darwin10-ios/src (cd ffmpeg; CC="/Developer/Platforms/iPhoneOS.platform/Developer/usr/bin/gcc-4.2" CXX="/Developer/Platforms/iPhoneOS.platform/Developer/usr/bin/g++-4.2" LD="/Developer/Platforms/iPhoneOS.platform/Developer/usr/bin/ld" RANLIB="/Developer/Platforms/iPhoneOS.platform/Developer/usr/bin/ranlib" AR="/Developer/Platforms/iPhoneOS.platform/Developer/usr/bin/ar" STRIP="/Developer/Platforms/iPhoneOS.platform/Developer/usr/bin/strip" ./configure --prefix=/Project/vlc/vlc-new_2/VLC-1.1.0-iOS/extras/contrib/hosts/arm-apple-darwin10/ios --extra-cflags="--std=gnu99 -DHAVE_STDINT_H" --extra-ldflags="-L/Project/vlc/vlc-new_2/VLC-1.1.0-iOS/extras/contrib/hosts/arm-apple-darwin10/ios/lib -arch armv7 -L/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS4.3.sdk/usr/lib -arch armv7" --enable-cross-compile --cc=/Developer/Platforms/iPhoneOS.platform/Developer/usr/bin/gcc-4.2 --arch=arm --disable-debug --enable-gpl --enable-postproc --disable-ffprobe --disable-ffserver --disable-ffmpeg --disable-ffplay --disable-devices --disable-protocols --disable-avfilter --disable-network --target-os=darwin --sysroot=/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS4.3.sdk --disable-runtime-cpudetect --enable-neon --cpu=cortex-a8 --disable-shared --enable-static && make -j1 && make install-libs install-headers) /Developer/Platforms/iPhoneOS.platform/Developer/usr/bin/gcc-4.2 is unable to create an executable file. C compiler test failed. If you think configure made a mistake, make sure you are using the latest version from SVN. If the latest version fails, report the problem to the ffmpeg-user(a)mplayerhq.hu mailing list or IRC #ffmpeg on irc.freenode.net. Include the log file "config.log" produced by configure as this will help solving the problem. make[1]: *** [.ffmpeg] Error 1 make: *** [using-src] Error 2 feelingkyi-macbook:ios feelingk$

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