October 2018 - ffmpeg-user - lists.ffmpeg.org

Drawtext and Metadata
by Grant Griffith 17 Oct '18

17 Oct '18

Hey everyone I'm hoping to wanting to create a mosaic tile for video clips. I've got the majority of the setup dialed in, but the drawtext metadata is fighting me. I'd like to have my mosaic tiles with a box containing filename, duration, encoder and optionally file size. So far this is where I am... ./ffmpeg -i "$1" \ -vf "select=gt(scene\,0.087),\ scale=192:-1,\ tile=10x10,\ drawtext="fontfile=/System/Library/Fonts/Helvetica.ttc":\ text=`basename "${1}"` :\ fontcolor=magenta:\ shadowx=1.5:\ shadowy=2:\ fontsize=60\:\ x=(w-text_w)/2:\ y=(h-text_h)/2:\ box=1:\ boxcolor=lime@.5:\ boxborderw=240:" \ -frames:v 1 \ -q:v 7 \ ~/Desktop/test.jpg I've tested all kinds of %{metadata:%duration} kind of variants, but I'm not having any luck. My last grasp would be to probe, store the data in json and then cobble together the key values into the text field, but it seems like running to binaries is pointless since ffmpeg already knows everything I'm really after. Can this be done?

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Lossless cut from a h264 video with audio
by Samat Galimov 17 Oct '18

17 Oct '18

Hello, tl;dr: Q: is there a way to cut a 10 second clip from a h264 video (downloaded from youtube) to later use it in web browsers with no quality loss? What I have tried so far: http://alpha.rawg.io/question/ Long version: My inputs are http://alpha.rawg.io/question/cook.txt <http://alpha.rawg.io/question/cook.txt> My first attempt is to opt-in for copy codecs using the following command: /usr/bin/env ffmpeg -y -ss 0:03:18 -t 0:00:10 -i cook.mp4 -c copy cook-start.mp4 &> cook-start.txt What I've got is: - Safari: audio/video sync is OK, beginning is OK, but additional 3 seconds of audio without video in the end - Chrome: audio/video is out of sync Then I tried to specify -ss as an output option: /usr/bin/env ffmpeg -y -i cook.mp4 -ss 0:03:18 -t 0:00:10 -c copy cook-end.mp4 &> cook-end.txt Safari & Chrome: first 3 seconds have no video, but audio only. Is there a clever trick to overcome this apparent keyframe location issue while not re-encoding videos? If there is no way to avoid re-encoding, what options should I use to minimise quality loss? Here is the webpage to check out my results & source files: https://alpha.rawg.io/question/ <https://alpha.rawg.io/question/> Thank you very much in advance. Samat.

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Converting to Dialogic VOX format with ffmpeg
by איל חסון 16 Oct '18

16 Oct '18

I know ffmpeg has a vox decoder, but do you know if there is any way to use ffmpeg to CREATE vox files?

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Roku Blu-Ray Playback: Blue Flickering at Bottom of Screen
by Joshua Blagden 16 Oct '18

16 Oct '18

Hi folks, I got into Blu-Rays about six months ago and I've been "digitizing" them with MakeMKV. I have some Doctor Who Blu-Rays from 2011 that are in MPEG-4, but are interlaced with MBAFF interlacing. I tried deinterlacing with Handbrake (Decomb/Bob), but that just made it worse by adding frequent pixelation to the problem. The copies of these Blu-Rays play fine in VLC, but when I try to watch them on my TV via my Roku, I frequently see blue fuzz flickering on the bottom third or so of the screen. How can I fix this? Is there a special kind of deinterlacing I don't know about? Thanks, Josh Blagden ------------------------------------------------------------------------

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Obscure Watermarking with ffmpeg possible?
by Chris von Görstinger 16 Oct '18

16 Oct '18

Hello, is it currently possible to watermark a video with obscure watermaerking algorithm in ffmpeg? Or is it planed for future to implement such a filter? A big player on obscure watermarking is "nexguard" ( https://dtv.nagra.com/watermarking) Nexguard has an API for implementing their technology in external transcoders. Maybe this would be a possible solution for using obscure watermarking with ffmpeg? Best Regards Christoph Gerstbauer

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Installing ffmpeg from source, missing libs
by paweg 16 Oct '18

16 Oct '18

I'm trying to install ffmpeg from source using this guide https://trac.ffmpeg.org/wiki/CompilationGuide/Centos. Getting error in configure ERROR: freetype2 not found manually in command line: $pkg-config --exists freetype2 || echo 'no lib' gives me nothing, so it exists. And also: $pkg-config --cflags freetype2 -I/usr/include/freetype2 $rpm -q freetype freetype-2.4.2-7.fc14.x86_64 freetype-2.4.2-7.fc14.i686 It seems like the configure script doesn't pass this pkg-config --exists command. Could it be wrong freetype version? How do I check the reason of such error? I've also tried ffmpeg version 3.1.11, where there is a special case for libfreetype check in ffmpeg configure. I'm on some previous Fedora version. The configure command I use: ./configure --prefix="$HOME/ffmpeg_build" --pkg-config="--static" --extra-cflags="-I$HOME/ffmpeg_build/include" --extra-ldflags="-L$HOME/ffmpeg_build/lib" --extra-libs=-lpthread --extra-libs=-lm --bindir="$HOME/bin" --enable-libfreetype --enable-libmp3lame --enable-libopus --enable-libvorbis --enable-libx264 --enable-nonfree --enable-gpl'

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Live Streaming in browser just downloads a file no streaming happening
by Abhisek Techie 16 Oct '18

16 Oct '18

Hi, I am trying to stream live video from camera in the browser but it downloads file named test.swf and I don't see any video streaming in browser Below are the steps that I have performed 1.ffserver.conf that I am using HTTPPort 8090 HTTPBindAddress 0.0.0.0 MaxHTTPConnections 2000 MaxClients 1000 MaxBandwidth 15000 <Feed feed1.ffm> File /tmp/feed1.ffm FileMaxSize 200K ACL allow 127.0.0.1 </Feed> # Flash <Stream test.swf> Feed feed1.ffm VideoCodec flv Format swf VideoFrameRate 30 VideoIntraOnly NoAudio </Stream> <Stream stat.html> Format status # Only allow local people to get the status ACL allow localhost ACL allow 192.168.0.0 192.168.255.255 </Stream> <Redirect index.html> URL http://www.ffmpeg.org/ </Redirect> 2.I started the ffserver ffserver -d -f /etc/ffserver.conf 3.Linked camera with feed ffmpeg -r 30 -s 320*240 -hide_banner -f video4linux2 -loglevel debug -i /dev/video0 -f flv http://localhost:8090/feed1.ffm 4.Opened browser and typed http://localhost:8090/test.swf to watch the feed, I found test.swf file getting downloaded and don't see streaming. Please suggest if I am missing or doing something wrong Regards

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duplicate symbol
by 桃源老師 13 Oct '18

13 Oct '18

Hello list member, I’m now trying to build static ffmpeg on macOS Mojave 10.14. Then I got the following "duplicate symbol” error at linking. How can I fix it??? Please help me!! CC fftools/ffmpeg_videotoolbox.o LD ffmpeg_g duplicate symbol _get_rdmult_delta in: /Volumes/ffmpeg_compile/lib/libaom.a(encodeframe.c.o) /Volumes/ffmpeg_compile/lib/libvpx.a(vp9_encodeframe.c.o) duplicate symbol _init_tpl_stats in: /Volumes/ffmpeg_compile/lib/libaom.a(encoder.c.o) /Volumes/ffmpeg_compile/lib/libvpx.a(vp9_encoder.c.o) duplicate symbol _init_gop_frames in: /Volumes/ffmpeg_compile/lib/libaom.a(encoder.c.o) /Volumes/ffmpeg_compile/lib/libvpx.a(vp9_encoder.c.o) duplicate symbol _get_quantize_error in: /Volumes/ffmpeg_compile/lib/libaom.a(encoder.c.o) /Volumes/ffmpeg_compile/lib/libvpx.a(vp9_encoder.c.o) duplicate symbol _round_floor in: /Volumes/ffmpeg_compile/lib/libaom.a(encoder.c.o) /Volumes/ffmpeg_compile/lib/libvpx.a(vp9_encoder.c.o) duplicate symbol _mc_flow_dispenser in: /Volumes/ffmpeg_compile/lib/libaom.a(encoder.c.o) /Volumes/ffmpeg_compile/lib/libvpx.a(vp9_encoder.c.o) duplicate symbol _motion_compensated_prediction in: /Volumes/ffmpeg_compile/lib/libaom.a(encoder.c.o) /Volumes/ffmpeg_compile/lib/libvpx.a(vp9_encoder.c.o) duplicate symbol _mode_estimation in: /Volumes/ffmpeg_compile/lib/libaom.a(encoder.c.o) /Volumes/ffmpeg_compile/lib/libvpx.a(vp9_encoder.c.o) duplicate symbol _wht_fwd_txfm in: /Volumes/ffmpeg_compile/lib/libaom.a(encoder.c.o) /Volumes/ffmpeg_compile/lib/libvpx.a(vp9_encoder.c.o) duplicate symbol _tpl_model_update in: /Volumes/ffmpeg_compile/lib/libaom.a(encoder.c.o) /Volumes/ffmpeg_compile/lib/libvpx.a(vp9_encoder.c.o) duplicate symbol _tpl_model_store in: /Volumes/ffmpeg_compile/lib/libaom.a(encoder.c.o) /Volumes/ffmpeg_compile/lib/libvpx.a(vp9_encoder.c.o) duplicate symbol _tpl_model_update_b in: /Volumes/ffmpeg_compile/lib/libaom.a(encoder.c.o) /Volumes/ffmpeg_compile/lib/libvpx.a(vp9_encoder.c.o) duplicate symbol _get_overlap_area in: /Volumes/ffmpeg_compile/lib/libaom.a(encoder.c.o) /Volumes/ffmpeg_compile/lib/libvpx.a(vp9_encoder.c.o) ld: 13 duplicate symbols for architecture x86_64 clang: error: linker command failed with exit code 1 (use -v to see invocation) make: *** [ffmpeg_g] Error 1 Best Regards, // Miya aka. TougenRoushi

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Multiple Streams using ffmpeg (got 2 working, need 4)
by Rad J 11 Oct '18

11 Oct '18

Hello There, I would like to stream 4 cams to YouTube using ffmpeg. I was able to get 2 to work as follows: ffmpeg -rtsp_transport tcp -i "rtsp://xxxx:xxxx@10.1.10.125:554/cam/realmonitor?channel=1&subtype=0" -i "rtsp://xxxx:xxxx@10.1.10.125:554/cam/realmonitor?channel=2&subtype=0" -f lavfi -i anullsrc -filter_complex " [0:v] setpts=PTS-STARTPTS, scale=800x448,setsar=1[upperleft]; [1:v] setpts=PTS-STARTPTS, scale=800x448,setsar=1[upperright]; [upperleft][upperright]hstack[base]" -map [base] -map 2 -f flv rtmp:// x.rtmp.youtube.com/live2/xxxx:xxxx-xxxx:xxxx But how do I add two more below those two? You can view the two here: https://www.youtube.com/channel/UCxyIPYgLqtqLl2one2J7goQ/live Thanks, Zarks

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How to choose pixfmt output for video generator
by Martin Vignali 11 Oct '18

11 Oct '18

Hello, I would like to use a generator for testing Some generator, seems to have several pix fmt supported, but can't find the way to choose one For example allyuv seems to support yuv444p, gbrp ./ffmpeg -f lavfi -i allyuv=rate=5:duration=1 -pix_fmt yuv444p -f null - -loglevel debug ==> Output yuv444p ./ffmpeg -f lavfi -i allyuv=rate=5:duration=1 -pix_fmt gbrp -f null - -loglevel debug ==> Following log, seems to output yuv444p then convert to gbrp Thanks Martin

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