May 2017 - ffmpeg-user - lists.ffmpeg.org

Re: [FFmpeg-user] FFmpeg changing maximum video bitrate during streaming?
by Dave Ellis 20 May '17

20 May '17

Does anyone have any ideas on the question I asked previously? Is this list the best place to ask? >I'm using the following command to stream video: - > >ffmpeg.exe -re -i test.avi -b:v 960k -minrate 960k -maxrate 960k -bufsize 240k -an -s 480x640 -r 30 -threads 0 -vcodec libx264 -preset veryfast -x264opts keyint=90:no-scenecut=1:min-keyint=90 -vprofile baseline -level 3.0 -pix_fmt yuv420p -f rtp rtp://127.0.0.1:62712 > >Is there a way of communicating with FFmpeg whilst it is streaming to change the video bitrate? > >I have looked at the filters and zmq but cannot find anything for the video bitrate. > >Thanks

3 2

Thumbnail tile slow on big video files
by trash＠skrilnetz.net 18 May '17

18 May '17

Hi, I run the code below to produce a tile thumnail from video files. That seems to be very slow on big video files. Anything that I do wrong, or I could improve to speed up processing? ffmpeg -ss 720 -i $input_path -f image2 -vframes 1 -aspect 4:3 -filter:vf select='isnan(prev_selected_t)+gte(t-prev_selected_t\,720)',scale="'if(gt(a,4/3),128,-1)\':'if(gt(a,4/3),-1,96)\'",pad="w=128:h=97:x=(ow-iw)/2:y=(oh-ih)/2:color=black",tile=4x1 -y $output_filename Thanks!

2 2

gdigrab just capturing a still frame when using window title
by Kenn Sippell 17 May '17

17 May '17

Hello! I am attempting to use ffmpeg to record some video games. In this scenario I'm recording Dota 2 from my PC (working great) and from my laptop (having some problems). ffmpeg -f gdigrab -i desktop output.flv This command works fine on both my PC and my laptop. ffmpeg -f gdigrab -i title="Dota 2" output.flv This command works fine on my PC but does not work on my laptop. On my laptop, I'm often seeing either a) the game window is transparent, and I can see the desktop or other windows beneath it, or b) a single random frame from the game. In all cases the mouse is capturing accurately. My laptop has two graphic cards: - Intel HD Graphics 4600 - nVidia GeForce GTX 860M I thought this might just be a manifestation of this sort of issue -- https://obsproject.com/forum/threads/laptop-black-screen-when-capturing-rea… But I've tried configuring ffmpeg.exe as described with no results. Is this a well understood issue or one I can work around in gdigrab? Is there an alternative to gdigrab that can capture the game in Windows? I'm very performance conscious for my scenario (minimize CPU), is there an alternative to gdigrab that is less CPU intense? Bonus round lol --- Can anybody explain (or direct me to some reading material which would explain) what is happening under the covers here? Cheers! Kenn

3 2

Enconding and streaming raw pixel stream via WiFi
by Ralf Ramsauer 17 May '17

17 May '17

Hi, I'd like to use ffmpeg/ffserver to encode and stream a raw pixel stream. My intention is to capture a v4l2 cam device, do some magic with opencv and stream with ffserver and RTSP via WiFi, as the device is a flying microcopter platform with an unstable WiFi connection. This is the reason why I'd like to use RTSP via UDP. I decided to pass the raw pixel stream via an unnamed pipe to ffmpeg. Tricky, but this keeps all encoding/streaming stuff out of my C++ code. ffmpeg decodes the stream and sends it to a ffserver instance running on the same platform. ffserver binds to the WiFi interface, other computers on the same network are allowed to watch the RTSP stream. I'm open for better solutions. :) However, the pixel stream has no fix framerate, it produces as many frames as possible. IOW, a new frame is sent to stdout as soon as it is available. Effectively, this results in a framerate of about ~28fps. This is how I invoke ffmpeg: ./my_opencv_app | ffmpeg -f rawvideo -r 30 -pixel_format gray -video_size 640x480 -tune zerolatency -i - http://localhost:8081/foo.ffm Please find the corresponding ffserver.conf below. Everything *somehow* works, but not as intended. The video delay is constantly increasing, and it produces high network load (~1.4MB/s) for rather simple pictures (grayscaled). - My opencv app currently produces as many frames as possible. Should it produce frames at a (more or less) constant frame rate? - Apparently, this approach makes ffmpeg use the mpeg4 codec per default. This results in high network load, though my frames are only grayscaled. So I tried to switch to h26[45]. This broke everything. I get a bunch of errors and no video stream when I try to watch it with mplayer. I tried to replace my opencv app by a direct stream of the webcam with ffmpeg. Same issues. - What are 'recommended' codec settings for my use case? Which codec would probably be the best for me? (Sorry, I'm not an A/V guy ;) ) - I have to specify the framerate as a ffmpeg parameter "-r 30", and in the ffserver.conf. Why do I have to specify it twice? Why do I have to specify a framerate at all? - I'd like to keep latency as low as possible. Are there some special tweaks for achieving low latency with ffmpeg? - Is h26[45] suitable for streaming with an unstable connection? Is it robust against random failures? If it helps, I can push my stuff to some repository. Anything helps! Thanks Ralf ffserver.conf: HttpPort 8081 RtspPort 5554 HttpBindAddress 0.0.0.0 RTSPBindAddress 0.0.0.0 MaxClients 5 MaxBandwidth 100000 CustomLog - NoDefaults <Feed foo.ffm> File /tmp/foo.ffm FileMaxSize 1M ACL allow 127.0.0.1 </Feed> <Stream foo.sdp> Feed foo.ffm Format rtp Noaudio VideoSize 640x480 VideoFrameRate 30 ACL allow 0.0.0.0 </Stream>

2 2

ffmpeg from .json file to .ts or .mp4 ?
by pmcnamara 17 May '17

17 May '17

I'm trying to save a video playlist using ffmpeg.. file playlist is https://62skyfiregce-vimeo.akamaized.net/exp=1494971437~acl=%2F217020261%2F… when I save that.. I get a list like this (see JSON below) If I change the file type on the file above to .m3u8, I get this playlist.. #EXTM3U #EXT-X-VERSION:7 #EXT-X-MEDIA:TYPE=AUDIO,GROUP-ID="audio-low",NAME="audio",AUTOSELECT=YES,DEFAULT=YES,CHANNELS="2",URI="../../audio/751054707/playlist.m3u8" #EXT-X-MEDIA:TYPE=AUDIO,GROUP-ID="audio-high",NAME="audio",AUTOSELECT=YES,DEFAULT=YES,CHANNELS="2",URI="../../audio/751054719/playlist.m3u8" #EXT-X-STREAM-INF:CLOSED-CAPTIONS=NONE,PROGRAM-ID=1,BANDWIDTH=599835,AVERAGE-BANDWIDTH=495000,RESOLUTION=640x360,FRAME-RATE=29.970,CODECS="avc1.64001E,mp4a.40.2",AUDIO="audio-low" ../751054707/playlist.m3u8 #EXT-X-STREAM-INF:CLOSED-CAPTIONS=NONE,PROGRAM-ID=1,BANDWIDTH=3265488,AVERAGE-BANDWIDTH=2478000,RESOLUTION=1280x720,FRAME-RATE=29.970,CODECS="avc1.640020,mp4a.40.2",AUDIO="audio-high" ../751054719/playlist.m3u8 #EXT-X-STREAM-INF:CLOSED-CAPTIONS=NONE,PROGRAM-ID=1,BANDWIDTH=1792640,AVERAGE-BANDWIDTH=1486000,RESOLUTION=960x540,FRAME-RATE=29.970,CODECS="avc1.64001F,mp4a.40.2",AUDIO="audio-high" ../751054708/playlist.m3u8 If I copy out the playlist url extenstion and add it to the end of the URL like this.. https://62skyfiregce-vimeo.akamaized.net/exp=1494971437~acl=%2F217020261%2F… It will play the video, but there is no sound ? How do capture the .json file.. or how do I get the .m3u8 to play sound ?? -- JSON -- 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-- View this message in context: http://www.ffmpeg-archive.org/ffmpeg-from-json-file-to-ts-or-mp4-tp4680059.… Sent from the FFmpeg-users mailing list archive at Nabble.com.

2 3

Converting PTS to seconds
by tarun singhal 17 May '17

17 May '17

Hi, I am able to extract PTS of each frame in a video using mkvtimestamp_v2. Now since eventually i am trying to find timestamp in seconds of that frame. Can you please help me how to convert PTS into seconds? I got to know that mkvtimestamp_v2 provides PTS in timebase of 1/1000 is it same for all formats of content. How to use this timebase to convert PTS value to seconds Regards, Tarun Singhal Senior Software Engineer Accenture - India ( - +91-8105061683 | * tsinghal18(a)gmail.com

2 1

Query regarding mkvtimestamp_v2 filter
by tarun singhal 17 May '17

17 May '17

Hi All, I need help in understanding what does mkvtimestamp_v2 filter do. I tried to search documentation around it but couldnt find. All I could find was this command *ffmpeg -i usopen.mp4 -f mkvtimestamp_v2 -qscale:v 0 a.txt* which apparently seems to give out timestamp of each frame in the video. Can you please help? What other options are available with formatting of this filter output. Regards, Tarun

3 4

ffmpeg performance 3.3 vs. 3.2.4
by Chris 17 May '17

17 May '17

Hi, I'm batch transcoding h264 ts streams to h265. Lately, I replaced ffmpeg 3.2.4 with 3.3, and noticed that the average frame rate for transcoding dropped from about 2.4 to 1.0. For testing purposes, I have switched back to 3.2.4 for the next file, and the frame rate went up to 3.2.4 again. Command line: ffmpeg -analyzeduration 200M -probesize 200M -i "$LOCAL_SOURCE" -vf yadif=1 -map 0 -c:a copy -c:v libx265 -preset veryslow -x265-params crf=19 -strict experimental "$LOCAL_TARGET" I looked through the release notes, but couldn't really find anything that might be related. The machine is a server, i.e. a CPU without GPU, and an ASPEED VGA controller. Any idea for what this could be related to? Thanks, Chris

3 4

Question about ffmpeg -i video-clip.mp3 -lavfi showspectrumpic=s=100x40 out.jpg
by HQ HQ 16 May '17

16 May '17

Hi I have a quick question about ffmpeg. I want to extract spectrum from audio through commend ffmpeg -i video-clip.mp3 -lavfi showspectrumpic=s=100x40 out.jpg. I hope the output only include the spectrum, but the out.jpg also includes the labels and the legend, which I don't want. Could you please kindly enough show me how can I change my commend to get the pure spectrum? Thanks, Haoqi

2 1

need an example unix domain sockets usage
by Ratheendran R 16 May '17

16 May '17

Hi All, can any one help me with a working example using UNIX domain socket. *I am trying to ffmpeg and ffplay commands on ubuntu as below.the ffplay <command > gives a permission denied. ffmpeg exits immediatly * >>>>* ./ffplay -f mpegts unix:///tmp/ff.socket& *>>>>* sleep 2&& ./ffmpeg_g -re -i something -vcodec copy -acodec copy -f *>> * mpegts unix://tmp/ff.socket * *I am not able to make any progress for some time,please let me know if I am missing anything.* *Thanks,* *RS*

2 2