October 2011 - ffmpeg-user - lists.ffmpeg.org

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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feature request/suggestion: make the server and ffplay into sink filters :)
by Roger Pack 09 Dec '11

09 Dec '11

Hello. Now that ffmpeg has high quality filter ability with libavfilter, I was thinking... it would be great if at some point you could basically do the equivalent of the following: Split an input stream, send it to a "file" output as well as to a "server" output, or optionally also to a "view" output (ffplay). Kind of combining all of the various output options into sinks. Or maybe this is already in the works? This would allow me to not have to revert to VLC if, for instance, a users wants to view a stream as it is encoded (which some do). Thanks! -roger

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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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Thanks!
by Roger Pack 07 Nov '11

07 Nov '11

Just wanted to thank the ffmpeg team. I went to a conference the other day and one of the presenters showed us how to use ffmpeg in windows to remux videos. Then I realized just how wide spread and useful it is. Thanks again. -roger-

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8 channels audio to 8 x 1 channel audio
by Igor Podobiński 05 Nov '11

05 Nov '11

Hello, This is output of ffprobe: ------------------------------ ----------------------------------------------------------------------------- Input #0, mxf, from 'd:\Media\PFR\test.mxf': Duration: 00:00:19.56, start: 0.000000, bitrate: 62570 kb/s Stream #0:0: Video: mpeg2video (4:2:2), yuv422p, 720x608 [SAR 608:405 DAR 16:9], 50000 kb/s, 25 fps, 25 tbr, 25 tbn, 50 tbc Stream #0:1: Audio: pcm_s16le, 48000 Hz, 8 channels, s16, 6144 kb/s ------------------------------------------------------------------------------------------------------------ I am trying to demux this mxf file into: - 1 video file (m2v) - 8 mono audio files (wav) or 4 stereo files Is it even possible with ffmpeg? Thanks, Igor -- Igor Podobiński mob: +48 501031552 mail: ipodobin(a)gmail.com

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Issues splitting a 3gp file using -ss and -t options
by Deepika 05 Nov '11

05 Nov '11

Hi, I am trying to split a 3gp file using the command below and I get the following errors. Any help in solving this issue is highly appreciated. ffmpeg -i a.3gp -vcodec copy -acodec copy -ss 00:01:00 -t 00:01:00 achunk.3gp ffmpeg version git-2011-10-28-8d4e449, Copyright (c) 2000-2011 the FFmpeg developers built on Oct 28 2011 15:45:27 with gcc 4.6.1 configuration: --enable-gpl --enable-libfaac --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libtheora --enable-libvorbis --enable-libx264 --enable-nonfree --enable-postproc --enable-version3 --enable-x11grab libavutil 51. 22. 0 / 51. 22. 0 libavcodec 53. 23. 0 / 53. 23. 0 libavformat 53. 17. 0 / 53. 17. 0 libavdevice 53. 4. 0 / 53. 4. 0 libavfilter 2. 45. 1 / 2. 45. 1 libswscale 2. 1. 0 / 2. 1. 0 libpostproc 51. 2. 0 / 51. 2. 0 Seems stream 1 codec frame rate differs from container frame rate: 1073741824.00 (1073741824/1) -> 15.00 (15/1) Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'transcoder_appln/a.3gp': Metadata: major_brand : 3gp6 minor_version : 256 compatible_brands: 3gp6isomiso2 creation_time : 2011-10-27 06:51:59 copyright : copyright-eng : Duration: 00:02:21.80, start: 0.000000, bitrate: 477 kb/s Stream #0:0(eng): Audio: amr_nb (samr / 0x726D6173), 8000 Hz, 1 channels, flt, 12 kb/s Metadata: creation_time : 2011-10-27 06:51:59 handler_name : SoundHandler Stream #0:1(eng): Video: h264 (Main) (avc1 / 0x31637661), yuv420p, 352x288 [SAR 128:117 DAR 1408:1053], 457 kb/s, SAR 35:32 DAR 385:288, 15 fps, 15 tbr, 1500 tbn, 1073741824 tbc Metadata: creation_time : 2011-10-27 06:51:59 handler_name : VideoHandler *[3gp @ 0x2fc67e0] track 1: codec frame size is not set* Output #0, 3gp, to 'achunk.3gp': Metadata: major_brand : 3gp6 minor_version : 256 compatible_brands: 3gp6isomiso2 creation_time : 2011-10-27 06:51:59 copyright : copyright-eng : encoder : Lavf53.17.0 Stream #0:0(eng): Video: h264 (avc1 / 0x31637661), yuv420p, 352x288 [SAR 35:32 DAR 385:288], q=2-31, 457 kb/s, 1500 tbn, 1500 tbc Metadata: creation_time : 2011-10-27 06:51:59 handler_name : VideoHandler Stream #0:1(eng): Audio: amr_nb (samr / 0x726D6173), 8000 Hz, 1 channels, 12 kb/s Metadata: creation_time : 2011-10-27 06:51:59 handler_name : SoundHandler Stream mapping: Stream #0.1 -> #0.0 (copy) Stream #0.0 -> #0.1 (copy) *Could not write header for output file #0 (incorrect codec parameters ?)*

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Muxing raw H264 to container format (MP4, MOV)
by oblivion 03 Nov '11

03 Nov '11

Hi, I have a raw H264 stream that I want to mux into a container format in order to get timing information in it (for seeking purposes). I tried the standard option "-vcodec copy" and I get an empty file. ffmpeg -i input.h264 -vcodec copy out.mp4 I tried variations like specifying the frame rate and the format with "-f h264" but I get the same. Muxing it together with an audio file outputs a container containing the audio file only. The output for the command above is this: ffmpeg version N-33818-gd049257, Copyright (c) 2000-2011 the FFmpeg developers built on Oct 19 2011 23:01:30 with gcc 4.6.1 configuration: --disable-static --enable-shared --enable-gpl --enable-version3 --enable-runtime-cpudetect --enable-avisynth --enable-bzlib --enable-frei0r --e nable-libopencore-amrnb --enable-libopencore-amrwb --enable-libfreetype --enable -libgsm --enable-libmp3lame --enable-libopenjpeg --enable-librtmp --enable-libsc hroedinger --enable-libspeex --enable-libtheora --enable-libvo-aacenc --enable-l ibvo-amrwbenc --enable-libvorbis --enable-libvpx --enable-libx264 --enable-libxa vs --enable-libxvid --enable-zlib libavutil 51. 22. 0 / 51. 22. 0 libavcodec 53. 22. 0 / 53. 22. 0 libavformat 53. 17. 0 / 53. 17. 0 libavdevice 53. 4. 0 / 53. 4. 0 libavfilter 2. 44. 1 / 2. 44. 1 libswscale 2. 1. 0 / 2. 1. 0 libpostproc 51. 2. 0 / 51. 2. 0 [h264 @ 01E4E8E0] Estimating duration from bitrate, this may be inaccurate Seems stream 0 codec frame rate differs from container frame rate: 50.00 (50/1) -> 25.00 (50/2) Input #0, h264, from 'input.h264': Duration: N/A, bitrate: N/A Stream #0:0: Video: h264 (High), yuv420p, 1280x960, 25 fps, 25 tbr, 1200k tb n, 50 tbc File 'out.mp4' already exists. Overwrite ? [y/N] y Output #0, mp4, to 'out.mp4': Metadata: encoder : Lavf53.17.0 Stream #0:0: Video: h264 (![0][0][0] / 0x0021), yuv420p, 1280x960, q=2-31, 2 5 tbn, 25 tbc Stream mapping: Stream #0.0 -> #0.0 (copy) Press [q] to stop, [?] for help frame= 0 fps= 0 q=-1.0 Lsize= 0kB time=00:00:00.00 bitrate= 0.0kbits /s video:0kB audio:0kB global headers:0kB muxing overhead 1.#INF00% I looks like it does absolutely no processing and just exists. Re-encoding the file works but I don't want that, I just want to use the already encoded data.\ I also tried an older tool, avc2avi.exe, which works fine but it writes AVI 1.0 files that are limited in size and I would need AVI 2.0 for large files. Thanks for any suggestions. -- View this message in context: http://ffmpeg-users.933282.n4.nabble.com/Muxing-raw-H264-to-container-forma… Sent from the FFmpeg-users mailing list archive at Nabble.com.

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watchable video tester program
by Tom Sparks 01 Nov '11

01 Nov '11

I am looking for a program that can scan though a videoand check to see if it is watchable? Are there macroblock errors? Is there dead/missing sound? Are there Frame errors? it needs to be able to work on non-original (re-compressed) video (mpg2/H.264 to Xvid) -- tom_a_sparks "It's a nerdy thing I like to do" Please use ISO approved file formats excluding Office Open XML - http://www.gnu.org/philosophy/no-word-attachments.html Ubuntu wiki page https://wiki.ubuntu.com/tomsparks 3 x (x)Ubuntu 10.04, Amiga A1200 WB 3.1, UAE AF 2006 Premium Edition, AF 2012 Plus Edition, Sam440 AOS 4.1.2, Roland DXY-1300 pen plotter, Cutok DC330 cutter/pen plotter Wanted: RiscOS system, GEOS system (C64/C128), Atari ST, Apple Macintosh (6502/68k/PPC only)

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how to make frame repeat?
by Hardik Sharma 01 Nov '11

01 Nov '11

Hi, How can I make the previous frame repeat if my current frame is getting dropped due to error? Please give your suggestion if possible. Thanks.

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