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

.m4a to .flv - image/video fails
by nreddig＠ptd.net 31 Mar '12

31 Mar '12

Hi all, I have greatly appreciated the information I have already gleaned from reading this forum. However I still can not solve my current problem. I am trying to convert from .m4a to .flv. These are podcast files (.m4a) built in garage band. Pictures were added as well and we would like to use this format to create weekly announcements because Garage Band is so easy for our non-technically oriented staff. Using ffmpeg the audio converts just fine but the "video" is not right. I guess it's because these files include chapter data not actual video. However when I convert it to any format the images fly through at different rates, then it seems to get stuck on a picture in the middle. The format I would like to convert to is flash so that I can easy display multiple announcement files using a flash player. I can convert .mov to .flv no problem. Converting .m4a to .mov and then .flv doesn't produce any better results. Here are the before and after files: http://www.warwicksd.org/warwick.m4a http://www.warwicksd.org/output.flv I used the following to get my conversion: ffmpeg -i warwick.m4a -b 300k -r 12 -s 300x300 -ar 22050 -y -ab 96k output.flv FFmpeg version SVN-rUNKNOWN, Copyright (c) 2000-2007 Fabrice Bellard, et al. configuration: --enable-gpl --enable-libfaac --enable-libfaad --enable- libmp3lame --disable-vhook --enable-shared libavutil version: 49.5.0 libavcodec version: 51.44.0 libavformat version: 51.14.0 built on Oct 22 2007 15:31:25, gcc: 3.3 20030304 (Apple Computer, Inc. build 1640) Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'warwick.m4a': Duration: 00:00:55.9, start: 0.000000, bitrate: 100 kb/s Stream #0.0(eng): Audio: mpeg4aac, 44100 Hz, stereo Stream #0.1(eng): Video: mjpeg, yuvj420p, 300x300, 44100.00 fps(r) Stream #0.2(eng): Data: tx3g / 0x67337874 Stream #0.3(eng): Data: text / 0x74786574 Output #0, flv, to 'output.flv': Stream #0.0(eng): Video: flv, yuv420p, 300x300, q=2-31, 300 kb/s, 12.00 fps (c) Stream #0.1(eng): Audio: libmp3lame, 22050 Hz, stereo, 96 kb/s Stream mapping: Stream #0.1 -> #0.0 Stream #0.0 -> #0.1 Press [q] to stop encoding frame= 83 fps= 21 q=2.0 Lsize= 1099kB time=6.9 bitrate=1301.6kbits/s video:70kB audio:657kB global headers:0kB muxing overhead 51.296550% .mov files convert nicely to .flv but these .m4as are just not working. Our current staff is very eager to use these Garage Band files to communicate announcements. I have been so desperate to get this particular file type to convert that I have been experimenting with grabbing the frames every 5 secs. and then rebuilding the images into video. This produces strange results and seems to be more programming then should be necessary. Thanks in advanced for any solutions you can provide. Nancy Reddig Web Programmer Warwick SD

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Scene detection
by foripepe＠yahoo.com 01 Mar '12

01 Mar '12

Hi, I would like to generate images from videos at every scene changes. My present solution is: - ffmpeg -i source_video -r 25 -an -vcodec mjpeg destination_video.avi - lav2yuv -S list.el destination_video.avi It generates a scene list text file with time codes that I use later to creating images. I was wondering maybe there is an easier solution. I have browsed the net to get a better solution (ffmpeg, sc_threshold etc.), but I couldn't find any other just my present lav2yus solution. Is it possible to use ffmpeg to create images on scene changes? Or is it possible to use ffmpeg to create a text file with the time codes of scene changes? If you have any idea, I would be very happy. Thanks in advance.

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Side-by-side frames
by alexandre.ferrieux＠orange-ftgroup.com 15 Feb '12

15 Feb '12

Hello, What is the canonical way of joining two video streams spatially, with frames laid out side-by-side (symmetric), or picture-in-picture (asymmetric) ? Something based on video filters ? Thanks in advance, -Alex

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dvbsub problem
by fencingleo＠gmail.com 13 Feb '12

13 Feb '12

Hello, I have some problems copying subtitle stream in a MPEG-TS file. I have a saved dvb MPEG-TS stream from my DVB device, and want to transcode it from h264 to mpeg4 video format while keeping the subtitle track untouched. There is no error reported from the ffmpeg process, but somehow the subtitle information is lost in the generated MPEG-TS file. When I view the original TS file in VLC, it displays the subtitle just fine. But with the generated file, the subtitle track and information is there, yet vlc doesn't display any subtitle. So I played with ffmpeg for a bit and found that when I try to extract the subtitle track from the generated TS file, I don't get anything. My idea is that if ffmpeg can (and should) mux all the stream correctly into the generated file I should be able to extract the same information from it afterward. To simplify the test I just copy the tracks and don't do any transcoding. Here's the information of the original file: Input #0, mpegts, from 'original.ts': Duration: 00:00:59.76, start: 12599.390500, bitrate: 4145 kb/s Program 1 Stream #0.0[0x44]: Audio: ac3, 48000 Hz, stereo, s16, 192 kb/s Stream #0.1[0x45]: Audio: ac3, 48000 Hz, stereo, s16, 192 kb/s Stream #0.2[0x46]: Video: h264, yuv420p, 720x576 [PAR 16:11 DAR 20:11], 25 fps, 25 tbr, 90k tbn, 50 tbc Stream #0.3[0x47](zho): Subtitle: dvbsub I ran the ffmpeg command like this: ffmpeg -i original.ts -vcodec copy -acodec copy -scodec copy new.ts The new.ts has this information: Input #0, mpegts, from 'new.ts': Duration: 00:00:59.76, start: 1.400000, bitrate: 4074 kb/s Program 1 Service01 Metadata: name : Service01 provider_name : FFmpeg Stream #0.0[0x100]: Video: h264, yuv420p, 720x576 [PAR 16:11 DAR 20:11], 25 fps, 25 tbr, 90k tbn, 50 tbc Stream #0.1[0x101]: Audio: ac3, 48000 Hz, stereo, s16, 192 kb/s Stream #0.2[0x102](zho): Subtitle: dvbsub The container looks right, except that Stream 0.2 doesn't have anything in it. I tried to extract the subtitle stream with ffmpeg: ffmpeg -i new.ts -an -vn -scodec copy -f rawvideo subtitle.data Subtitle.data is an empty file. To verify that the command works on the original TS file, ffmpeg -i original.ts -an -vn -scodec copy -f rawvideo subtitle.data This gives a subtitle.data of 108940 bytes. Also towards the end of ffmpeg output gives some hint: Output of extracting track from the original TS: Input #0, mpegts, from '*original.ts*': Duration: 00:00:59.76, start: 12599.390500, bitrate: 4145 kb/s Program 1 Stream #0.0[0x44]: Audio: ac3, 48000 Hz, stereo, s16, 192 kb/s Stream #0.1[0x45]: Audio: ac3, 48000 Hz, stereo, s16, 192 kb/s Stream #0.2[0x46]: Video: h264, yuv420p, 720x576 [PAR 16:11 DAR 20:11], 25 fps, 25 tbr, 90k tbn, 50 tbc Stream #0.3[0x47](zho): Subtitle: dvbsub Output #0, rawvideo, to 'subtitle.data': Metadata: encoder : Lavf52.64.2 Stream #0.0(zho): Subtitle: dvbsub Stream mapping: Stream #0.3 -> #0.0 Press [q] to stop encoding [NULL @ 0x2520d60]missing picture in access unit size= *106kB* time=57.86 bitrate= 15.1kbits/s video:0kB audio:0kB global headers:0kB muxing overhead inf% Output from extracting track from the ffmpeg created TS: Input #0, mpegts, from '*new.ts*': Duration: 00:00:59.76, start: 1.400000, bitrate: 4074 kb/s Program 1 Service01 Metadata: name : Service01 provider_name : FFmpeg Stream #0.0[0x100]: Video: h264, yuv420p, 720x576 [PAR 16:11 DAR 20:11], 25 fps, 25 tbr, 90k tbn, 50 tbc Stream #0.1[0x101]: Audio: ac3, 48000 Hz, stereo, s16, 192 kb/s Stream #0.2[0x102](zho): Subtitle: dvbsub Output #0, rawvideo, to 'subtitle.data': Metadata: encoder : Lavf52.64.2 Stream #0.0(zho): Subtitle: dvbsub Stream mapping: Stream #0.2 -> #0.0 Press [q] to stop encoding [NULL @ 0x23c4dd0]missing picture in access unit size= *0kB* time=10000000000.00 bitrate= 0.0kbits/s video:0kB audio:0kB global headers:0kB muxing overhead -nan% So does the mpegts muxer not put anything into the dvbsub track? If so, does other muxer do this correctly? I'm running Fedora 13, Linux fedora 2.6.33.5-124.fc13.x86_64 #1 SMP Fri Jun 11 09:38:12 UTC 2010 x86_64 x86_64 x86_64 GNU/Linux ffmpeg version is: FFmpeg version 0.6-rpmfusion, Copyright (c) 2000-2010 the FFmpeg developers built on Jul 27 2010 03:51:42 with gcc 4.4.4 20100630 (Red Hat 4.4.4-10) configuration: --prefix=/usr --bindir=/usr/bin --datadir=/usr/share/ffmpeg --incdir=/usr/include/ffmpeg --libdir=/usr/lib64 --mandir=/usr/share/man --arch=x86_64 --extra-cflags='-O2 -g -pipe -Wall -Wp,-D_FORTIFY_SOURCE=2 -fexceptions -fstack-protector --param=ssp-buffer-size=4 -m64 -mtune=generic' --extra-version=rpmfusion --enable-bzlib --enable-libdc1394 --enable-libdirac --enable-libfaad --enable-libgsm --enable-libmp3lame --enable-libopenjpeg --enable-libschroedinger --enable-libspeex --enable-libtheora --enable-libvorbis --enable-libvpx --enable-libx264 --enable-libxvid --enable-x11grab --enable-avfilter --enable-avfilter-lavf --enable-postproc --enable-pthreads --disable-static --enable-shared --enable-gpl --disable-debug --disable-stripping --shlibdir=/usr/lib64 --enable-runtime-cpudetect 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 0.11. 0 / 0.11. 0 libpostproc 51. 2. 0 / 51. 2. 0 FFmpeg 0.6-rpmfusion 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 0.11. 0 / 0.11. 0 libpostproc 51. 2. 0 / 51. 2. 0 Thanks, Leo

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Can ffmpeg extract clips from ogg video files?
by vfclists＠googlemail.com 23 Jan '12

23 Jan '12

I am trying to extract clips from an ogg video generated from vlc 1.0 and ffmpeg always crashes when trying to do so. Is ffmpeg capable of doing that? -- Frank Church ======================= <a href="http://devblog.brahmancreations.com">devblog.brahmancreations.com</a>

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Re: [FFmpeg-user] how to use ffserver stream my desktop
by cristian.ocnarescu 10 Jan '12

10 Jan '12

Hello! I am having the exact problem. I want to stream video only, de-commented the "NoAudio" in the config file and commented all the audio-related stuff in <stream> tag, still it wants audio. Anybody found an answer to this? Thanks! -- View this message in context: http://ffmpeg-users.933282.n4.nabble.com/how-to-use-ffserver-stream-my-desk… Sent from the FFmpeg-users mailing list archive at Nabble.com.

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Frame/gop accurate video splitting (fps, gop, length known)
by abodera＠gmail.com 22 Dec '11

22 Dec '11

Hey there! A simple use case: 1) a sample mp4 file of 23.98 tbr, 264 + aac, 1:51.27 in length 2) the file (lotr trailer) encoded with: ./ffmpeg -i ./lordoftherings_h640_ml.mov -vcodec libx264 -g 50 ./lord.mp4 3) we want to split it in 3 parts: 30s, 10s and the rest of the stream Chunks we want to have: 1) ~30s (00:00:00 - 00:00:30) 2) ~10s (00:00:30 - 00:00:40) 3) ~71s (00:00:40 - 00:01:51) File info: Duration: 00:01:51.27, start: 0.000000, bitrate: 256 kb/s Stream #0.0(eng): Video: h264, yuv420p, 640x272, 192 kb/s, 47.90 fps, 23.98 tbr, 24k tbn, 47.95 tbc Stream #0.1(eng): Audio: aac, 48000 Hz, stereo, s16, 58 kb/s The only tools right now are -vframes, -ss and -t. Frame-accurate seeking is missing/broken (?). Below is my approach. a) chunk 1 is 30s, so with 23.98 fps that gives 719.5 frames. b) Because it's gop 50 we round down to 700 frames = 29.1909925 seconds from start c) Chunk 1 extraction: "-vframes 699" d) Chunk 2 starts from frames 700 and ends in 10s = 239.8 frames ~ 250 frames (gop 50) e) Chunk 2 extraction: "-ss 29.1909925 -vframes 250" f) Chunk 3 starts at 40s = 959.2th frames (23.98 fps). Rounding down to 50 gives us 950th frame g) 950th frame is at aproximately 39.61635 sec. g) Chunk 3 extraction: "-ss 39.61635" Of course I wouldn't be bothering the community if it worked properly :-) The chunks are off by many seconds, lengths are off. Please assist - what am I doing wrong? Is there any more elegant way to do that? Also: a simpler case that I thought would "just work" - split the stream in two: ./ffmpeg -y -ss -t 30 -i ./lord.mp4 -vcodec copy -acodec copy lord-chunk1.mp4 ./ffmpeg -y -ss 00:00:30 -i ./lord.mp4 -vcodec copy -acodec copy lord-chunk2.mp4 It doesn't work! This will also end badly with two arbitrary length chunks with seek times that make little sense. How is it done properly? Thanks! Arthur. ps: FFmpeg version SVN-r20880 -- __ /.)\ +48 695 600 936 \(./ abodera at gmail.com

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Is there any way to hide the configure command options?
by Nitin Bodke 07 Dec '11

07 Dec '11

Hi All, When we execute ffmpeg, ffmpeg displays configuration options. e.g configuration: --prefix=/sandbox/mmsc/schundi/workspace/CA/msg-platform/transcoder/alembik/codecs/ffmpeg-0.5.1/release --extra-cflags=-I/sandbox/mmsc/schundi/workspace/CA/msg-platform/transcoder/alembik/codecs/faac-1.28/release/include --extra-cflags=-I/sandbox/mmsc/schundi/workspace/CA/msg-platform/transcoder/alembik/codecs/faad2-2.7/release/include --extra-cflags=-I/sandbox/mmsc/schundi/workspace/CA/msg-platform/transcoder/alembik/codecs/x264-20100425-2245/release/include --extra-cflags=-I/sandbox/mmsc/schundi/workspace/CA/msg-platform/transcoder/alembik/codecs/opencore-amr-0.1.2/release/include --extra-cflags=-I/sandbox/mmsc/schundi/workspace/CA/msg-platform/transcoder/alembik/codecs/libgsm-1.0.13/inc/ --extra-ldflags=-L/sandbox/mmsc/schundi/workspace/CA/msg-platform/transcoder/alembik/codecs/faac-1.28/release/lib --extra-ldflags=-L/sandbox/mmsc/schundi/workspace/CA/msg-platform/transcoder/alembik/codecs/faad2-2.7/release/lib --extra-ldflags=-L/sandbox/mmsc/schundi/workspace/CA/msg-platform/transcoder/alembik/codecs/x264-20100425-2245/release/lib --extra-ldflags=-L/sandbox/mmsc/schundi/workspace/CA/msg-platform/transcoder/alembik/codecs/opencore-amr-0.1.2/release/lib --extra-ldflags=-L/sandbox/mmsc/schundi/workspace/CA/msg-platform/transcoder/alembik/codecs/libgsm-1.0.13/lib --enable-gpl --enable-pthreads --enable-version3 --enable-nonfree --enable-static --enable-shared --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libfaac --enable-libfaad --enable-libx264 --enable-libgsm --enable-libmp3lame --extra-cflags=-I/sandbox/mmsc/schundi/workspace/CA/msg-platform/transcoder/alembik/codecs/lame.3.98.4/release/include --extra-ldflags=-L/sandbox/mmsc/schundi/workspace/CA/msg-platform/transcoder/alembik/codecs/lame.3.98.4/release/lib Is there any way to hide this? Thanks, Nitin.

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XDCAM HD 35
by domich1＠gmail.com 20 Nov '11

20 Nov '11

Does anybody knows can I transcode material to XDCAM HD 35 format with mxf wrapper and what is the exact command. I' ve seen the example for XDCAM HD 422 50 Mbit on the ffmbc site. ffmpeg -i <input_file> -pix_fmt yuv422p -vcodec mpeg2video -flags +ildct+ilme -top 1 -dc 10 -flags2 +ivlc+non_linear_q -qmin 1 -lmin '1*QP2LAMBDA' -vtag xd5c -rc_max_vbv_use 1 -rc_min_vbv_use 1 -b 50000k -minrate 50000k -maxrate 50000k -bufsize 36408333 -bf 2 -aspect 16:9 -acodec pcm_s16be -f mov output.mov -newaudio Is there equivalent to that command for XDCAM HD 35Mbit. Thank you ! -- View this message in context: http://ffmpeg-users.933282.n4.nabble.com/XDCAM-HD-35-tp3009996p3009996.html Sent from the FFmpeg-users mailing list archive at Nabble.com.

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iPhone Matrix Rotation Info
by ben.knight＠f-i.com 27 Sep '11

27 Sep '11

Hi. I am using ffmpeg to encode videos both uploaded from the web and from iPhones. Currently, we are rotating the iPhone videos with another script. This has worked great so far however we just launched a mobile version of our site and now videos that have been rotated 90 degrees won?t play on the iPhone. The videos that are rotated 270 degrees work fine. I am wondering if there is a way to encode the file with ffmpeg so that it keeps the rotation matrix information from the iPhone so that if I try to play it again on the iPhone it works? Thanks *Ben*

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