Comments on: Basic video editing with FFmpeg on Linux http://eugenia.gnomefiles.org/2009/05/20/basic-video-editing-with-ffmpeg-on-linux/ Thu, 18 Mar 2010 06:56:13 +0000 http://wordpress.org/?v=2.9.2 hourly 1 By: Eugenia http://eugenia.gnomefiles.org/2009/05/20/basic-video-editing-with-ffmpeg-on-linux/#comment-7303 Eugenia Sun, 24 May 2009 20:59:59 +0000 http://eugenia.gnomefiles.org/2009/05/20/basic-video-editing-with-ffmpeg-on-linux/#comment-7303 I just tried to cut an AVCHD HF11 .mts file I had around, and it did cut. I saved it as <a href="http://www.itbroadcastanddigitalcinema.com/ffmpeg_howto.html#Encoding_VC-3" rel="nofollow">Avid DNxHD</a> for video (145Mb bitrate), and pcm_s16le for audio. HOWEVER, as I said above, FFmpeg is so bloody buggy with AVCHD, that it thinks that 60i is 60 progressive frames, and so you end up with DOUBLE the time. For example, a 3 second AVCHD file will get saved as a 6 second one! And if you add the interlaced flags for DNxHD, you will end up with 12 seconds! The bug is in ffmpeg. You just need to go to their dev mailing list, and start shouting at them for not having fixed that bug for months now. They have no excuse in my opinion, given the popularity of the format. Please note that not all AVCHD files behave the same on ffmpeg. Some files from other manufacturers exhibit different behavior. I just tried to cut an AVCHD HF11 .mts file I had around, and it did cut. I saved it as Avid DNxHD for video (145Mb bitrate), and pcm_s16le for audio. HOWEVER, as I said above, FFmpeg is so bloody buggy with AVCHD, that it thinks that 60i is 60 progressive frames, and so you end up with DOUBLE the time. For example, a 3 second AVCHD file will get saved as a 6 second one! And if you add the interlaced flags for DNxHD, you will end up with 12 seconds! The bug is in ffmpeg. You just need to go to their dev mailing list, and start shouting at them for not having fixed that bug for months now. They have no excuse in my opinion, given the popularity of the format. Please note that not all AVCHD files behave the same on ffmpeg. Some files from other manufacturers exhibit different behavior.

]]> By: sorta works http://eugenia.gnomefiles.org/2009/05/20/basic-video-editing-with-ffmpeg-on-linux/#comment-7302 sorta works Sun, 24 May 2009 20:45:22 +0000 http://eugenia.gnomefiles.org/2009/05/20/basic-video-editing-with-ffmpeg-on-linux/#comment-7302 Thank you for the quick reply. You're probably right: currently, ffmpeg cannot properly export AVCHD (.mts) nor flash (.flv) files. By the way, I am using an SVN version of ffmpeg built last Thursday. Below is the result of my "ffmpeg -version", for anyone who is interested. Thanks. ================== $ ffmpeg -version FFmpeg version SVN-r18890, Copyright (c) 2000-2009 Fabrice Bellard, et al. configuration: --prefix=/usr --extra-cflags='-Wall -g ' --cc='ccache cc' --libdir=${prefix}/lib --shlibdir=${prefix}/lib --bindir=${prefix}/bin --incdir=${prefix}/include/ffmpeg --enable-shared --enable-libmp3lame --enable-gpl --enable-libfaad --mandir=${prefix}/share/man --enable-libvorbis --enable-pthreads --enable-libfaac --enable-libxvid --enable-postproc --enable-libamr-nb --enable-libamr-wb --enable-x11grab --enable-libgsm --enable-libx264 --enable-libtheora --enable-libdc1394 --enable-libspeex --enable-nonfree --disable-stripping --enable-avfilter --enable-libdirac --disable-decoder=libdirac --enable-libschroedinger --disable-encoder=libschroedinger --enable-avfilter-lavf --enable-libopenjpeg --disable-altivec --disable-armv5te --disable-armv6 --disable-vis libavutil 50. 3. 0 / 50. 3. 0 libavcodec 52.29. 0 / 52.29. 0 libavformat 52.33. 0 / 52.33. 0 libavdevice 52. 2. 0 / 52. 2. 0 libavfilter 0. 5. 0 / 0. 5. 0 libswscale 0. 7. 1 / 0. 7. 1 libpostproc 51. 2. 0 / 51. 2. 0 built on May 21 2009 08:51:17, gcc: 4.3.3 FFmpeg SVN-r18890 libavutil 50. 3. 0 / 50. 3. 0 libavcodec 52.29. 0 / 52.29. 0 libavformat 52.33. 0 / 52.33. 0 libavdevice 52. 2. 0 / 52. 2. 0 libavfilter 0. 5. 0 / 0. 5. 0 libswscale 0. 7. 1 / 0. 7. 1 libpostproc 51. 2. 0 / 51. 2. 0 Thank you for the quick reply.

You’re probably right: currently, ffmpeg cannot properly export AVCHD (.mts) nor flash (.flv) files.

By the way, I am using an SVN version of ffmpeg built last Thursday. Below is the result of my “ffmpeg -version”, for anyone who is interested.

Thanks.

==================

$ ffmpeg -version
FFmpeg version SVN-r18890, Copyright (c) 2000-2009 Fabrice Bellard, et al.
configuration: –prefix=/usr –extra-cflags=’-Wall -g ‘ –cc=’ccache cc’ –libdir=${prefix}/lib –shlibdir=${prefix}/lib –bindir=${prefix}/bin –incdir=${prefix}/include/ffmpeg –enable-shared –enable-libmp3lame –enable-gpl –enable-libfaad –mandir=${prefix}/share/man –enable-libvorbis –enable-pthreads –enable-libfaac –enable-libxvid –enable-postproc –enable-libamr-nb –enable-libamr-wb –enable-x11grab –enable-libgsm –enable-libx264 –enable-libtheora –enable-libdc1394 –enable-libspeex –enable-nonfree –disable-stripping –enable-avfilter –enable-libdirac –disable-decoder=libdirac –enable-libschroedinger –disable-encoder=libschroedinger –enable-avfilter-lavf –enable-libopenjpeg –disable-altivec –disable-armv5te –disable-armv6 –disable-vis
libavutil 50. 3. 0 / 50. 3. 0
libavcodec 52.29. 0 / 52.29. 0
libavformat 52.33. 0 / 52.33. 0
libavdevice 52. 2. 0 / 52. 2. 0
libavfilter 0. 5. 0 / 0. 5. 0
libswscale 0. 7. 1 / 0. 7. 1
libpostproc 51. 2. 0 / 51. 2. 0
built on May 21 2009 08:51:17, gcc: 4.3.3
FFmpeg SVN-r18890
libavutil 50. 3. 0 / 50. 3. 0
libavcodec 52.29. 0 / 52.29. 0
libavformat 52.33. 0 / 52.33. 0
libavdevice 52. 2. 0 / 52. 2. 0
libavfilter 0. 5. 0 / 0. 5. 0
libswscale 0. 7. 1 / 0. 7. 1
libpostproc 51. 2. 0 / 51. 2. 0

]]> By: Eugenia http://eugenia.gnomefiles.org/2009/05/20/basic-video-editing-with-ffmpeg-on-linux/#comment-7301 Eugenia Sun, 24 May 2009 20:28:55 +0000 http://eugenia.gnomefiles.org/2009/05/20/basic-video-editing-with-ffmpeg-on-linux/#comment-7301 I only tried them with the latest ffmpeg, and with HDV .m2t files. HV20/30 HDV users comprise the primary readership of my blog. FFmpeg and mencoder suck with AVCHD files, they have many bugs. Apparently, there have been a slew of patches for AVCHD, but the maintainers are very slow integrating them to their stack, hence the eternal incompatibilities with AVCHD. More over, you can't do this kind of processing shown in the tutorial if ffmpeg can't export in the same format. For example, you can't cut an AVCHD file and re-exporting it as AVCHD, because ffmpeg doesn't know how to export in AVCHD. You might want to cut it, and then export it as a different file format, e.g. the Avid DNxHD, or HDV .m2t. I only tried them with the latest ffmpeg, and with HDV .m2t files. HV20/30 HDV users comprise the primary readership of my blog.

FFmpeg and mencoder suck with AVCHD files, they have many bugs. Apparently, there have been a slew of patches for AVCHD, but the maintainers are very slow integrating them to their stack, hence the eternal incompatibilities with AVCHD.

More over, you can’t do this kind of processing shown in the tutorial if ffmpeg can’t export in the same format. For example, you can’t cut an AVCHD file and re-exporting it as AVCHD, because ffmpeg doesn’t know how to export in AVCHD. You might want to cut it, and then export it as a different file format, e.g. the Avid DNxHD, or HDV .m2t.

]]> By: sorta works http://eugenia.gnomefiles.org/2009/05/20/basic-video-editing-with-ffmpeg-on-linux/#comment-7300 sorta works Sun, 24 May 2009 20:25:57 +0000 http://eugenia.gnomefiles.org/2009/05/20/basic-video-editing-with-ffmpeg-on-linux/#comment-7300 The ffmpeg seek (-ss) and duration (-t) arguments worked on a Quicktime file. However, they don't seem to work on an AVCHD from a Canon HF11 (.mts). Also, I can't get them to work on flash (.flv) files. By the way, I am keeping these two ffmpeg arguments positioned in the command before the input file argument. The ffmpeg seek (-ss) and duration (-t) arguments worked on a Quicktime file.

However, they don’t seem to work on an AVCHD from a Canon HF11 (.mts).

Also, I can’t get them to work on flash (.flv) files.

By the way, I am keeping these two ffmpeg arguments positioned in the command before the input file argument.

]]> By: Jorge http://eugenia.gnomefiles.org/2009/05/20/basic-video-editing-with-ffmpeg-on-linux/#comment-7274 Jorge Thu, 21 May 2009 02:55:49 +0000 http://eugenia.gnomefiles.org/2009/05/20/basic-video-editing-with-ffmpeg-on-linux/#comment-7274 Thank you Eugenia for this post! I was thinking about that the other day..how to trim & put together my HV30 M2T files in a lossless way. Nice wrap up! Thank you Eugenia for this post! I was thinking about that the other day..how to trim & put together my HV30 M2T files in a lossless way. Nice wrap up!

]]> By: Tom http://eugenia.gnomefiles.org/2009/05/20/basic-video-editing-with-ffmpeg-on-linux/#comment-7273 Tom Thu, 21 May 2009 02:20:00 +0000 http://eugenia.gnomefiles.org/2009/05/20/basic-video-editing-with-ffmpeg-on-linux/#comment-7273 But...but you don't like Linux! But…but you don’t like Linux!

]]> By: kragil http://eugenia.gnomefiles.org/2009/05/20/basic-video-editing-with-ffmpeg-on-linux/#comment-7272 kragil Thu, 21 May 2009 02:01:46 +0000 http://eugenia.gnomefiles.org/2009/05/20/basic-video-editing-with-ffmpeg-on-linux/#comment-7272 <a href="http://www.linuxhaxor.net/2009/05/19/how-to-convert-any-video-file-format-under-linux/" rel="nofollow">Girls and ffmpeg</a> ;) Girls and ffmpeg ;)

]]> By: Eugenia http://eugenia.gnomefiles.org/2009/05/20/basic-video-editing-with-ffmpeg-on-linux/#comment-7268 Eugenia Wed, 20 May 2009 20:59:32 +0000 http://eugenia.gnomefiles.org/2009/05/20/basic-video-editing-with-ffmpeg-on-linux/#comment-7268 The firmware of the TV (or part of it) runs Linux. The firmware of the TV (or part of it) runs Linux.

]]> By: Andy McCall http://eugenia.gnomefiles.org/2009/05/20/basic-video-editing-with-ffmpeg-on-linux/#comment-7267 Andy McCall Wed, 20 May 2009 20:58:03 +0000 http://eugenia.gnomefiles.org/2009/05/20/basic-video-editing-with-ffmpeg-on-linux/#comment-7267 Nice post, thanks. One quick question - what do you mean your TV runs Linux? Do you mean your PC, running Linux, is connected to the TV, or do you mean the firmware of your TV is based on Linux? Or, do you mean something totally different :) Thanks! Nice post, thanks.

One quick question – what do you mean your TV runs Linux? Do you mean your PC, running Linux, is connected to the TV, or do you mean the firmware of your TV is based on Linux? Or, do you mean something totally different :)

Thanks!

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