September 2014 - ffmpeg-user - lists.ffmpeg.org

Syncing clips based on audio waveform?
by Arthur Wait 05 Oct '17

05 Oct '17

Hi all, This is coming from out of left field I imagine, but I'm wondering if anyone knows of a filter (or chain of filters) which would allow me to align/sync two video clips based on matches in their audio waveforms. I'm shooting events with multiple cameras and would like to either trim the clips to a precise, matching starting frame or generate a metadata "offset" marker indicating how far off one clip is from the other in time. Then I can trim the clips to match. Is this possible in ffmpeg (or anywhere else for that matter!)? Thanks very much! Art

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could not find codec parameters for stream 0 unspecified size
by Ashish Lal 09 Aug '17

09 Aug '17

I am trying to convert a live rtsp stream (H264 + MPEG2 TS ) into MP4 using ffmpeg. I am getting an error "could not find codec parameters for stream 0 unspecified size". Any help in fixing this is appreciated. ffmpeg -rtsp_transport tcp -i rtsp://AA.BB.CC.DD:5555/mpeg2TransportStreamFr omUDPSourceTest -analyzeduration 999999999 -probesize 99999999 -vcodec libx264 -s 176x144 -b:v 256k -f mp4 -movflags frag_keyframe+empty_moov op.mp4 ffmpeg version 2.2.2 Copyright (c) 2000-2014 the FFmpeg developers built on May 27 2014 09:12:51 with gcc 4.7 (Debian 4.7.2-5) configuration: --enable-libx264 --enable-encoder=libx264 --enable-libvpx --pre fix=/home/ashish/ffmpeg-2.2.2/mybuild --enable-gpl --enable-debug --disable-stri pping --disable-optimizations --enable-memalign-hack libavutil 52. 66.100 / 52. 66.100 libavcodec 55. 52.102 / 55. 52.102 libavformat 55. 33.100 / 55. 33.100 libavdevice 55. 10.100 / 55. 10.100 libavfilter 4. 2.100 / 4. 2.100 libswscale 2. 5.102 / 2. 5.102 libswresample 0. 18.100 / 0. 18.100 libpostproc 52. 3.100 / 52. 3.100 [NULL @ 0x235cd60] non-existing PPS 0 referenced [h264 @ 0x235cd60] non-existing PPS 0 referenced [h264 @ 0x235cd60] decode_slice_header error [h264 @ 0x235cd60] no frame! [h264 @ 0x235cd60] non-existing PPS 0 referenced ......... ......... Last message repeated 1 times [h264 @ 0x235cd60] decode_slice_header error [h264 @ 0x235cd60] no frame! [h264 @ 0x235cd60] non-existing PPS 0 referenced [rtsp @ 0x232fc40] decoding for stream 0 failed [rtsp @ 0x232fc40] Could not find codec parameters for stream 0 (Video: h264 ([2 7][0][0][0] / 0x001B)): unspecified size Consider increasing the value for the 'analyzeduration' and 'probesize' options rtsp://AA.BB.CC.DD:5555/mpeg2TransportStreamFromUDPSourceTest: could not find codec parameters Conversion failed! Regards Ashish

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Compiling FFMPEG with ffplay support
by Stas Oskin 13 Jun '17

13 Jun '17

Hi. Did the compilation parameters changed in recent FFMPEG version? Configuring the FFMPEG like this: ./configure --prefix=/usr --enable-pthreads Does not produce ffplay anymore. I tried to add --enable-ffplay, without any result. Any idea what I'm missing? Thanks.

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How do I encode DVB Subtitles?
by Wagner Patriota 02 May '17

02 May '17

*QUESTION 1:* How do I add a STR file to a MPEG-TS file with the "DVB subtitle codec"? If so, could you give me a sample command line? Thank. I am trying: ffmpeg -i video.ts *-i subtitle.srt* -vcodec copy -acodec copy *-scodec dvbsub* output.ts The stream is created because I can see it with MediaInfo, but the subtitles don't appear! *QUESTION 2:* How do I use the command *slang*? I try to use it, but ffmpeg says the command doesn't exist. Thank you.

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How to use global_header, fflags, rtpflags parameter.
by Ly Tran Cong 06 Dec '16

06 Dec '16

Hello, Can anyone tell me how to use flags +global_header, fflags +latm, rtpflags +latm Which parameter using with video encode and which parameter using with audio encode. Thanks -- Regards, Tran Ly Vega Corporation 98 Hoang Quoc Viet Str, Hanoi, Vietnam Tel: 84 4 755 4190 Fax: 84 4 755 4190 Mobile: 84 91 487 1115 www.vega.com.vn; www.clip.vn; www.chacha.vn; www.ringring.vn

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Flip in sws_scale
by romulo.fernandes＠gmail.com 11 Mar '16

11 Mar '16

Hello, I'm using libswscale to scale and convert pixel format from frames that I capture from the screen. In my windows build the frames that I capture are in DIB format. I'm using FFMPEG SVN rev 16437. Calling sws_scale normally I get the image correctly, except that it's vertically flipped. If I change the srcSliceY from 0 to srcHeight and srcSliceH from srcHeight to 0, I get a grey image (with correct dimensions). If I keep the srcSliceY in 0 and change srcSliceH from srcHeight to -srcHeight, I also get that grey image. Is there a way to make sws_scale flip the image for me ?

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Howto compile ffplay.c in seperate directory with my own svn-version of ffmpeg
by tps＠netmaster.dk 23 Feb '16

23 Feb '16

Dear All I have compiled svn-version of ffmpeg. I only do configure and make. I do not do make install because I don't want this svn-version of ffmpeg to overwrite the 'official' Ubuntu version of ffpeg that is also on the host. Now I want to compile my own version of ffplay.c so I create a directory ffplay at the same level as the svn ffmpeg-directory. I copy ffplay.c from ffmpeg to ffplay. Now what gcc options should I use to compile ffplay.c? I tried with this but got tons of errors: gcc -o ffplay ffplay.c -I../ffmpeg -L../ffmpeg/libavcodec -L../ffmpeg/libavformt -L../ffmpeg/libswscale -L../ffmpeg/libavutil -lavcodec -lavformat -lswscale -lavutil -lmp3lame -lx264 `sdl-config --cflags --libs` I note that when I do the make in the svn ffmpeg-directory there are a lot of options on the gcc command. I hardly know any of the options. Thanks in advance

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a -vf for broadcast safe
by Jim Shupert 30 Dec '15

30 Dec '15

I was wondering if there is a means to ensure that a file is transcoded as 'broadcast safe' input a unCompressed yuv avi and get a second Uncompressed yuv avi or mov and it would be 'broadcast safe'. I wish for the functionality of the broadcast safe effect available withing final cut 6. I do not find anything in the documentation. I wonder if Hald CLUT would be of any utility. thanks jim s

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timestamp calculation
by Chau Pham 24 Jun '15

24 Jun '15

Hi Everybody, Suppose that I know AVPacket element: pts, dts, duration How could I calculate the timestamp (hh:mm:ss:MMM)? Thank You,Chau Pham.

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V4L2 recording results in invalid data & buffer still owned errors.
by Louis Rossmann 09 Jun '15

09 Jun '15

Hi I am using a Magewell XI100DUSB-HDMI capture device to record video from a camera. My end goal is to be able to record two cameras simultaneously, one with embedded audio, both HDMI sources. Here is the command I am using to record one of the cameras *$ ffmpeg -f v4l2 -framerate 60 -s 1920x1080 -i /dev/video1 -f alsa -i pulse -c:v libx264 -crf 0 -preset ultrafast -c:a pcm_s16le outfile3.mkv* Sometimes this works perfectly! Unfortunately, at other times, I get audio without video, with this error. *[video4linux2,v4l2 @ 0xfb3e80] The v4l2 frame is 0 bytes, but 4147200 bytes are expected* */dev/video1: Invalid data found when processing input* *[video4linux2,v4l2 @ 0xfb3e80] Some buffers are still owned by the caller on close.* My current resolution to this problem is to simply re-run the command until it records. Sometimes it will record on the 3rd try,sometimes it will record on the 100th try. This is a huge inconvenience, and if I plan to work with two of these at once in the future, it will only get worse. Here is an example of the command when it works, and an example of it when it does not work, just incase I left anything out in that short output above. *$ ffmpeg -f v4l2 -framerate 60 -s 1920x1080 -i /dev/video1 -f alsa -i pulse -c:v libx264 -crf 0 -preset ultrafast -c:a pcm_s16le outfile3.mkv* *ffmpeg version N-65991-g8c63a0d Copyright (c) 2000-2014 the FFmpeg developers* * built on Sep 4 2014 22:48:40 with gcc 4.8.3 (Gentoo 4.8.3 p1.1, pie-0.5.9)* * configuration: --prefix=/usr --libdir=/usr/lib64 --shlibdir=/usr/lib64 --mandir=/usr/share/man --enable-shared --cc=x86_64-pc-linux-gnu-gcc --cxx=x86_64-pc-linux-gnu-g++ --ar=x86_64-pc-linux-gnu-ar --optflags='-march=native -O3 -pipe' --extra-cflags='-march=native -O3 -pipe' --extra-cxxflags='-march=native -O3 -pipe' --disable-static --enable-gpl --enable-postproc --enable-avfilter --enable-avresample --disable-stripping --enable-version3 --enable-indev=v4l2 --enable-outdev=v4l2 --disable-indev=oss --disable-indev=jack --disable-outdev=oss --enable-bzlib --disable-runtime-cpudetect --disable-debug --disable-doc --disable-gnutls --enable-hardcoded-tables --enable-iconv --enable-network --disable-openssl --enable-ffplay --enable-vaapi --disable-vdpau --enable-zlib --enable-libvo-aacenc --disable-libvo-amrwbenc --enable-libmp3lame --enable-libfaac --enable-libtheora --disable-libtwolame --enable-libwavpack --disable-libwebp --enable-libx264 --disable-libx265 --enable-libxvid --disable-libcdio --disable-libiec61883 --disable-libdc1394 --disable-libcaca --disable-openal --enable-opengl --enable-libv4l2 --enable-libpulse --enable-x11grab --disable-libflite --enable-frei0r --disable-fontconfig --disable-ladspa --disable-libass --enable-libfreetype --disable-libsoxr --disable-pthreads --disable-libopencore-amrwb --disable-libopencore-amrnb --disable-libfdk-aac --disable-libbluray --disable-libcelt --disable-libgme --disable-libgsm --disable-libmodplug --enable-libopus --disable-libquvi --disable-librtmp --disable-libssh --disable-libschroedinger --enable-libspeex --enable-libvorbis --disable-libvpx --disable-libzvbi --disable-armv5te --disable-armv6 --disable-armv6t2 --disable-neon --disable-vfp --disable-mips32r2 --disable-mipsdspr1 --disable-mipsdspr2 --disable-mipsfpu --disable-altivec --disable-amd3dnow --disable-amd3dnowext --enable-avx --enable-avx2 --enable-fma3 --enable-fma4 --enable-mmxext --enable-sse3 --enable-ssse3 --enable-sse4 --enable-sse42 --cpu=host --enable-nonfree* * libavutil 54. 7.100 / 54. 7.100* * libavcodec 56. 1.100 / 56. 1.100* * libavformat 56. 3.100 / 56. 3.100* * libavdevice 56. 0.100 / 56. 0.100* * libavfilter 5. 0.103 / 5. 0.103* * libavresample 2. 1. 0 / 2. 1. 0* * libswscale 3. 0.100 / 3. 0.100* * libswresample 1. 1.100 / 1. 1.100* * libpostproc 53. 0.100 / 53. 0.100* *[video4linux2,v4l2 @ 0xfb3e80] The v4l2 frame is 0 bytes, but 4147200 bytes are expected* *Input #0, video4linux2,v4l2, from '/dev/video1':* * Duration: N/A, bitrate: 1990656 kb/s* * Stream #0:0: Video: rawvideo (YUY2 / 0x32595559), yuyv422, 1920x1080, 1990656 kb/s, 60 fps, 60 tbr, 1000k tbn, 1000k tbc* *[pcm_s16le @ 0xfb5ea0] Warning: not compiled with thread support, using thread emulation* *Guessed Channel Layout for Input Stream #1.0 : stereo* *Input #1, alsa, from 'pulse':* * Duration: N/A, start: 1409951144.268999, bitrate: 1536 kb/s* * Stream #1:0: Audio: pcm_s16le, 48000 Hz, 2 channels, s16, 1536 kb/s* *No pixel format specified, yuv422p for H.264 encoding chosen.* *Use -pix_fmt yuv420p for compatibility with outdated media players.* *[libx264 @ 0xfd29a0] Warning: not compiled with thread support, using thread emulation* *[libx264 @ 0xfd29a0] using cpu capabilities: MMX2 SSE2Fast SSSE3 SSE4.2 AVX AVX2 FMA3 LZCNT BMI2* *[libx264 @ 0xfd29a0] profile High 4:4:4 Predictive, level 4.2, 4:2:2 8-bit* *[libx264 @ 0xfd29a0] 64 - core 142 - H.264/MPEG-4 AVC codec - Copyleft 2003-2014 - http://www.videolan.org/x264.html <http://www.videolan.org/x264.html> - options: cabac=0 ref=1 deblock=0:0:0 analyse=0:0 me=dia subme=0 psy=0 mixed_ref=0 me_range=16 chroma_me=1 trellis=0 8x8dct=0 cqm=0 deadzone=21,11 fast_pskip=0 chroma_qp_offset=0 threads=6 lookahead_threads=1 sliced_threads=0 nr=0 decimate=1 interlaced=0 bluray_compat=0 constrained_intra=0 bframes=0 weightp=0 keyint=250 keyint_min=25 scenecut=0 intra_refresh=0 rc=cqp mbtree=0 qp=0* *[pcm_s16le @ 0xfd38c0] Warning: not compiled with thread support, using thread emulation* *[rawvideo @ 0xfb5040] Warning: not compiled with thread support, using thread emulation* *[pcm_s16le @ 0xfd14e0] Warning: not compiled with thread support, using thread emulation* *Output #0, matroska, to 'outfile3.mkv':* * Metadata:* * encoder : Lavf56.3.100* * Stream #0:0: Video: h264 (libx264) (H264 / 0x34363248), yuv422p, 1920x1080, q=-1--1, 60 fps, 1k tbn, 60 tbc* * Metadata:* * encoder : Lavc56.1.100 libx264* * Stream #0:1: Audio: pcm_s16le ([1][0][0][0] / 0x0001), 48000 Hz, stereo, s16, 1536 kb/s* * Metadata:* * encoder : Lavc56.1.100 pcm_s16le* *Stream mapping:* * Stream #0:0 -> #0:0 (rawvideo (native) -> h264 (libx264))* * Stream #1:0 -> #0:1 (pcm_s16le (native) -> pcm_s16le (native))* *Press [q] to stop, [?] for help* *[video4linux2,v4l2 @ 0xfb3e80] The v4l2 frame is 0 bytes, but 4147200 bytes are expected* */dev/video1: Invalid data found when processing input* *frame= 0 fps=0.0 q=0.0 size= 1kB time=00:00:00.47 bitrate= 12.7kbits/sframe= 0 fps=0.0 q=0.0 size= 1kB time=00:00:00.96 bitrate= 6.3kbits/sframe= 0 fps=0.0 q=0.0 size= 1kB time=00:00:01.47 bitrate= 4.1kbits/sframe= 0 fps=0.0 q=0.0 size= 1kB time=00:00:01.97 bitrate= 3.1kbits/sframe= 0 fps=0.0 q=0.0 Lsize= 391kB time=00:00:02.02 bitrate=1585.6kbits/s * *video:0kB audio:380kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 2.976411%* *[video4linux2,v4l2 @ 0xfb3e80] Some buffers are still owned by the caller on close.*

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