March 2017 - ffmpeg-user - lists.ffmpeg.org

Synchronize video and audio from SDP file
by Jonathan Kanarek 27 Mar '17

27 Mar '17

Hi, I have RTP packets in node.js server and I want to forward them to ffmpeg. I generate SDP files in the node.js server side and execute ffmpeg with the SDP as input. SDP: v=0 o=mediasoup 579ba7f3ba8b38632222e85adc6a8b7bed13aae9 0 IN IP4 192.168.193.182 s=579ba7f3ba8b38632222e85adc6a8b7bed13aae9 c=IN IP4 192.168.193.182 t=0 0 a=group:LS video audio m=audio 33402 RTP/AVP 111 a=rtpmap:111 opus/48000 a=fmtp:111 minptime=10;useinbandfec=1 a=rtcp-fb:111 transport-cc a=extmap:1 urn:ietf:params:rtp-hdrext:ssrc-audio-level a=mid:audio a=sendrecv m=video 33404 RTP/AVP 107 a=rtpmap:107 H264/90000 a=fmtp:107 level-asymmetry-allowed=1;packetization-mode=1;profile-level-id=42e01f a=rtcp-fb:107 ccm fir a=rtcp-fb:107 nack a=rtcp-fb:107 nack pli a=rtcp-fb:107 goog-remb a=rtcp-fb:107 transport-cc a=extmap:2 urn:ietf:params:rtp-hdrext:toffset a=extmap:3 http://www.webrtc.org/experiments/rtp-hdrext/abs-send-time a=extmap:4 urn:3gpp:video-orientation a=extmap:5 http://www.ietf.org/id/draft-holmer-rmcat-transport-wide-cc-extensions-01 a=extmap:6 http://www.webrtc.org/experiments/rtp-hdrext/playout-delay a=mid:video a=sendrecv Command: ffmpeg -max_delay 5000 -reorder_queue_size 16384 -protocol_whitelist file,crypto,udp,rtp -re -i input.sdp -vcodec copy -acodec aac -y output.mp4 I weird video that plays at each frame either the video or the audio but never both of them together. BTW, when I create separate SDP files for the video and the audio and stream them as two inputs into the same output, I get valid stream but the audio is not in sync (about a second offset). ffmpeg -max_delay 5000 -reorder_queue_size 16384 -protocol_whitelist file,crypto,udp,rtp -re -i video.0.sdp -max_delay 5000 -reorder_queue_size 16384 -protocol_whitelist file,crypto,udp,rtp -re -i audio.1.sdp -vcodec copy -acodec aac -shortest -y output.mp4 What is wrong with my SDP? Thanks, Johnathan Kanarek

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ffmpeg fails to compile with opencv of Fedora 25
by pgaltieri . 27 Mar '17

27 Mar '17

I have checked out the latest version of ffmpeg from Git repository and for the last week when I try to compile it I get ERROR: opencv not found If you think configure made a mistake, make sure you are using the latest version from Git. If the latest version fails, report the problem to the ffmpeg-user(a)ffmpeg.org mailing list or IRC #ffmpeg on irc.freenode.net. Include the log file "config.log" produced by configure as this will help solve the problem. I have the opencv libraries installed. The error comes from the following: BEGIN /tmp/ffconf.N7phMWii.c 1 #include <opencv2/core/core_c.h> 2 #include <stdint.h> 3 long check_cvCreateImageHeader(void) { return (long) cvCreateImageHeader; } 4 int main(void) { int ret = 0; 5 ret |= ((intptr_t)check_cvCreateImageHeader) & 0xFFFF; 6 return ret; } END /tmp/ffconf.N7phMWii.c gcc -D_ISOC99_SOURCE -D_FILE_OFFSET_BITS=64 -D_LARGEFILE_SOURCE -D_POSIX_C_SOURCE=200112 -D_XOPEN_SOURCE=600 -DPIC -I/usr/include/opencl-utils -std=c11 -fomit-frame-pointer -fPIC -pthread -I/usr/include/harfbuzz -I/usr/include/glib-2.0 -I/usr/lib64/glib-2.0/include -I/usr/include/freetype2 -I/usr/include/libpng16 -I/usr/include/fribidi -I/usr/include/freetype2 -I/usr/include/libpng16 -I/usr/include/opencv -c -o /tmp/ffconf.JalceQGi.o /tmp/ffconf.N7phMWii.c gcc -L/usr/local/lib64 -Wl,--as-needed -Wl,-z,noexecstack -I/usr/include/opencv -o /tmp/ffconf.Fy5RqLpT /tmp/ffconf.JalceQGi.o -lopencv_shape -lopencv_stitching -lopencv_superres -lopencv_videostab -lopencv_aruco -lopencv_bgsegm -lopencv_bioinspired -lopencv_ccalib -lopencv_cvv -lopencv_dnn -lopencv_dpm -lopencv_fuzzy -lopencv_hdf -lopencv_line_descriptor -lopencv_optflow -lopencv_plot -lopencv_reg -lopencv_saliency -lopencv_stereo -lopencv_structured_light -lopencv_rgbd -lopencv_surface_matching -lopencv_tracking -lopencv_datasets -lopencv_text -lopencv_face -lopencv_video -lopencv_ximgproc -lopencv_calib3d -lopencv_features2d -lopencv_flann -lopencv_xobjdetect -lopencv_objdetect -lopencv_ml -lopencv_xphoto -lopencv_highgui -lopencv_videoio -lopencv_imgcodecs -lopencv_photo -lopencv_imgproc -lopencv_core -lopencore-amrwb -lopencore-amrnb -lmp3lame -lgsm -lass -lcrystalhd -lm -llzma -lbz2 -lz -pthread /tmp/ffconf.JalceQGi.o: In function `cvPointFrom32f': ffconf.N7phMWii.c:(.text+0x5ca): undefined reference to `cvRound' ffconf.N7phMWii.c:(.text+0x5e2): undefined reference to `cvRound' /tmp/ffconf.JalceQGi.o: In function `cvReadInt': ffconf.N7phMWii.c:(.text+0xf00): undefined reference to `cvRound' collect2: error: ld returned 1 exit status This is from config.log. I don't know what the exact change is, but this code needs to be compiled with g++ not gcc. Any assistance is appreciated. Paolo

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Slight blur on converted video
by Dave 27 Mar '17

27 Mar '17

Hi guys, I am having a problem where there is a slight blur on converted videos. I am trying to automate a couple of workflows where Adobe Media Encoder is currently used. Here are the commands that I am running: MXF Conversion: ffmpeg -y -i in.mxf -r 25 -vf settb=1/25 -flags +ilme+ildct -timecode 00:00:00:00 -acodec pcm_s16le -filter_complex "[:1:a][:2:a]amerge=inputs=2[aout]" -map "[aout]" -map 0:0 -qscale:v 6 -vcodec prores_ks -profile:v 1 -video_track_timescale 25 -copytb -1 out.mov MP4 Conversion: ffmpeg -y -i in.mp4 -acodec pcm_s16le -vcodec prores_ks -profile:v 1 -vf scale=interl=1 -sws_flags full_chroma_inp+full_chroma_int -copytb -1 out.mov I have uploaded a couple of sample screenshots to http://www.bit.st/screenshots/ <http://www.bit.st/screenshots/> Thank you in advance! /dave.

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ffserver support
by Ofir Attia 26 Mar '17

26 Mar '17

Hi, I posted question in one of the threads on the forum. There is some updates regard continue maintain ffserver ? developers should consider use it in new implementations of streaming servers ? there is alternative ? Thanks.

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Unable to receive RTP payload type 97 without an SDP file describing it
by Mickael MONSIEUR 25 Mar '17

25 Mar '17

Hello, I try to make a low latency sound link with ffmpeg. With MP3, it works: Encoder: ffmpeg -re -f alsa -i default:CARD=CODEC -acodec mp3 -ab 128k -ac 2 -f rtp rtp://10.1.0.19:8000 Decoder: ffplay rtp://127.0.0.1:8000 It works! With libopus (better codec) Encoder: ffmpeg -re -f alsa -i default:CARD=CODEC -acodec libopus -ab 64k -ac 2 -f rtp rtp://10.1.0.19:8000 Decoder: ffplay rtp://127.0.0.1:8000 i have the error: [rtp @ 0xb45004a0] Unable to receive RTP payload type 97 without an SDP file describing it Input #0, rtp, from 'rtp://127.0.0.1:8000': Duration: N/A, bitrate: N/A Failed to open file 'rtp://127.0.0.1:8000' or configure filtergraph ffplay version N-81350-g3282e31 Copyright (c) 2003-2016 the FFmpeg developers built with gcc 4.9.2 (Raspbian 4.9.2-10) configuration: --arch=armel --target-os=linux --enable-ffplay --enable-gpl --enable-libvorbis --enable-libopus --enable-libfdk-aac --enable-libtwolame --enable-libmp3lame --enable-nonfree --extra-cflags=-I/arm/include --extra-ldflags=-L/arm/lib --extra-libs=-ldl Thanks,

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SMTPE 2022-1 FEC
by Péter Bittó 24 Mar '17

24 Mar '17

Hello! I would like to ask, if it is available to compile ffmpeg with SMTPE 2022 Forward Error Correction in omxplayer example? Or how would it be possible to sens the buffer trough a smtpe python program before send it to omxplayer? Thanks, Peter Bittó

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compiler problem of Ffmpeg in Android 7.0 complier environment
by 《？》 24 Mar '17

24 Mar '17

Dear ： Ffmpeg R & D team , I can not compile ffmpeg successfully in Android 7.0 compiler environment. Always notic it had been successfully, But in fact, there is no successful compiler and no libraries can be found. the ffmpeg version is : 2.2.6 the pic as below and the attachment is my configueration: look forward to your replay. Best regards Phil 北京市海淀区北四环中路229号海泰大厦1717室 Tel No. : (86)010-82883008 Mobile : +86 18611387653

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H.265 Will not Play in Premiere
by Chris Colton 24 Mar '17

24 Mar '17

Hi, I'm using the following to transcode files to H.265 for final delivery since they can be so small and still look great. However, they play fine in VLC and even Vimeo, but Premiere Pro shows a blank, solid green image in the file instead of the actual video. Any ideas? I tried adding -vf format=yuv420p and it had no effect. -i "<SourceFileName>" -y -c:v libx265 -preset veryfast -crf 23 -c:a aac -b:a 320k -ar 48000 -ac 2 -max_muxing_queue_size 1000 "<OutputPath><PureSourceFileNameWOExtension>_H265.mp4" ᐧ

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Option -nostdin not working correctly?
by Lars Kiesow 24 Mar '17

24 Mar '17

Hi everyone, I want to run FFmpeg as a background process. But if you run something like the following command line, the process will bu suspended as long as FFmpeg is in the background: $ ffmpeg -y -f lavfi -i testsrc=r=1 -t 300 out.mp4& ffmpeg version 3.1.7 Copyright (c) 2000-2017 the FFmpeg developers ... [1]+ Stopped ffmpeg -y -f lavfi -i testsrc=r=1 -t 300 out.mp4 $ ls -l out.mp4 ls: cannot access 'out.mp4': No such file or directory Only after using `fg` to get the process to the foreground, FFmpeg will actually start the encoding. I have tried using the `-nostdin` option to fix that as the documentation states: -stdin Enable interaction on standard input. On by default unless standard input is used as an input. To explicitly disable interaction you need to specify "-nostdin". Disabling interaction on standard input is useful, for example, if ffmpeg is in the background process group. Roughly the same result can be achieved with "ffmpeg ... < /dev/null" but it requires a shell. But the option seems to have no effect, except for disabling the keyboard controls: $ ffmpeg -nostdin -y -f lavfi -i testsrc=r=1 -t 300 out.mp4& ffmpeg version 3.1.7 Copyright (c) 2000-2017 the FFmpeg developers ... [1]+ Stopped ffmpeg -nostdin -y -f lavfi -i ... out.mp4 $ ls -l out.mp4 ls: cannot access 'out.mp4': No such file or directory What works id to pipe /dev/null into ffmpeg like this: $ ffmpeg -f lavfi -i testsrc=r=1 -t 300 out.mp4 < /dev/null & The problem is that a shell is required for this and I do not want to start FFmpeg from a shell but from another process. Again, I can attach stdin to /dev/null in that subprocess call, but from how I interpret the docs, that is what `-nostdin` should prevent. Am I missing anything? Is that a bug in the current FFmpeg version? Best regards, Lars

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how to see what version of ffv1
by jshupert＠theppsgroup.com 24 Mar '17

24 Mar '17

Friends, 3 Qs q1 I am wondering how I can tell what version of ffv1 a file is encoded with? I find a ticket 1534 https://trac.ffmpeg.org/ticket/1534 that seems to have the same concern ffprobe -show_streams does *not show that a file was made with q2 is it true that the following command will create a file with ffv1 version 3? ffmpeg -i <input> -vcodec ffv1 -level 3 -coder 1 <outfile> q3 how can i see that my ffmpeg compile has ffv1 version 3 capability thanks much jS

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