June 2017 - ffmpeg-user - lists.ffmpeg.org

Re: [FFmpeg-user] Screen Capture - Windows 10 - making progress
by Ron Barnes 02 Jun '17

02 Jun '17

Hi All, Ok I have made some progress. First... I can now capture the Video Unfortunately I cannot format the command correctly to capture the audio from my speakers. I know there is a way to do it in one command, I just keep running into walls. I was able to capture both audio and video before but butchering those commands with the command below is not working. Would anyone be able to alter my FFmpeg command to capture the tab video AND the audio together. My Audio when listed in ffmpeg devices is "Stereo Mix (Realtek High Definition Audio)" Second... The captured video seems to be the full browser including the headers, not just the video inside the TAB. Would anyone know of a way to just capture the video inside the TAB? Here is where I'm at now..... This will get the TAB Name for the command. Make the TAB the Focus then Open a command prompt and type "tasklist /v /fi "imagename eq firefox.exe" /fo list | findstr Window" This FFmpeg command will capture the video from the TAB (Must Have Focus) in Firefox. ffmpeg -rtbufsize 2000M -f gdigrab -probesize 50M -vsync passthrough -frame_drop_threshold 4 -i title="Fox News - Breaking News Updates | Latest News Headlines | Photos & News Videos - Mozilla Firefox" -vf "scale=trunc(iw/2)*2:trunc(ih/2)*2" -pix_fmt yuv420p tabgrab.mp4 Any help would be great! -Ron -----Original Message----- From: ffmpeg-user [mailto:ffmpeg-user-bounces@ffmpeg.org] On Behalf Of Pavel Koshevoy Sent: Thursday, June 1, 2017 6:42 PM To: FFmpeg user questions <ffmpeg-user(a)ffmpeg.org> Subject: Re: [FFmpeg-user] Screen Capture - Windows 10 On Thu, Jun 1, 2017 at 2:19 PM, Ron Barnes <rbarnes(a)njdevils.net> wrote: > I was able to install the screen capture recorder and still no joy. How do the commercial vendors do it? > ☹ > Have you tried capturing with OBS? (https://obsproject.com/) You'll have better luck with it. If you want to know how they do it you can take a look at their source code. IIRC they actually inject a dll into the app being captured and register a callback to intercept something (maybe a buffer flip... I don't know exactly). Although, with DRM even that method may not work. Telestream Wirecast is similar to OBS, in case you want a commercial solution. Pavel. _______________________________________________ ffmpeg-user mailing list ffmpeg-user(a)ffmpeg.org http://ffmpeg.org/mailman/listinfo/ffmpeg-user To unsubscribe, visit link above, or email ffmpeg-user-request(a)ffmpeg.org with subject "unsubscribe".

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Ffmpeg closed caption .mxf xdcam file
by Douglas Santos 02 Jun '17

02 Jun '17

Good afternoon, I would like to know if it is already possible to copy an .mxf file with closed caption (vbi vanc), without losing it. I ask this because when I make a copy of the video of an .mxf file And only handle the audio in ffmpeg, the closed caption is not preserved. I would very much appreciate this information if it is possible to somehow do that. I saw that an impresario named floripa has software that does just that and uses the FFMPEG tool, just do not know what the magic they do to preserve the closed caption. Thank you very much in advance

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Bitrate Problem About Tee Pseudo-muxer
by Yang Zhang 02 Jun '17

02 Jun '17

Hi, I am trying use tee muxer to output sample stream to multiple destinations. everything seems works fine. but the bitrate is always show N/A, and ffprobe show bitrate=N/A also. here is the simplest tee muxer command I am using: *ffmpeg -i test.mp4 -vcodec h264_qsv -c:v h264 -f tee -map 0:v [f=flv]rtmp://192.168.2.2/test/1 <http://192.168.2.2/test/1>* and here is the output: *frame= 714 fps=164 q=-1.0 Lsize=N/A time=00:00:29.69 bitrate=N/A dup=2 drop=0 speed=6.82x * as you can see. the bitrate is shown N/A. but if I do not use tee muxer, just output to rtmp url. the bitrate will be show on the output. *ffmpeg -i test.mp4 -vcodec h264_qsv -c:v h264 -f flv -map 0:v rtmp://192.168.2.2/test/1 <http://192.168.2.2/test/1>* *frame= 395 fps=169 q=-1.0 Lsize= 580kB time=00:00:16.43 bitrate= 288.9kbits/s speed=7.03x* does anyone know why it does not show bitrate when use tee muxer? how can I fix this problem? thanks in advance!

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invalid video parameters (-15) with h264_qsv
by André Hänsel 01 Jun '17

01 Jun '17

Hi list, I'm trying to encode using h264_qsv, but I'm getting "Error initializing the encoder: invalid video parameters (-15)". Command line: ffmpeg -i src.mp4 -c:v h264_qsv -preset:v faster -q 5 -look_ahead 0 -loglevel debug test.mp4 Full log output: https://pastebin.com/raw/BNZyK0KA MediaSDK system analyzer: https://pastebin.com/raw/kfxBQSkH Regards, Andre

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Screen Capture - Windows 10
by Ron Barnes 01 Jun '17

01 Jun '17

Hello all, I have been trying for days to figure out how to capture the video from my desktop and save it as a playable file. I've been successful to a point. I am able to capture audio and video from my desktop as far as opening and using apps, moving my mouse and what not, but when I open a web browser and go to google or CNN or Yahoo or Fox News or anywhere for that matter, the Browser Window header is present (Firefox or IE) and the mouse pointer but the Browser Window with the content is a black screen. I believe it is because Microsoft no longer supports Direct Show and or my video card is not compatible with FFmpeg or the feed to the browser is somehow separate from the video I can see on the screen. I'm clueless here. Does anyone see where I may have gone south in the script below or the hardware I'm using? If possible, would someone offer an alternate script I can try? Here is my script. It has been put together using google searches as I'm very new to FFmpeg. ffmpeg -y -rtbufsize 2000M -f gdigrab -thread_queue_size 1024 -probesize 50M -r 30 -video_size 1920x1080 -draw_mouse 1 -i desktop -f dshow -i audio="Stereo Mix (Realtek High Definition Audio)" -c:v libx264 -r 30 -preset ultrafast -tune zerolatency -crf 25 -pix_fmt yuv420p -c:a aac -strict -2 -ac 2 -b:a 96k -y "I:\Captured\TestAV.mp4" Please let me start off with some information regarding my system. I have a 4GHZ/8 core AMD CPU with 128GB RAM, leveraging a 2TB Samsung SSD. My Net connection is FIOS Gigabit service. 1GB down and 850MB up. My Graphics card is NVIDIA GeForce GTX 560 with 2GB of memory. As you can see below I have only three direct show devices. A webcam, webcam microphone and Stereo Mix. There is no video device. I:\Captured>ffmpeg -list_devices true -f dshow -i dummy ffmpeg version N-86310-g220b24c Copyright (c) 2000-2017 the FFmpeg developers built with gcc 7.1.0 (GCC) configuration: --enable-gpl --enable-version3 --enable-cuda --enable-cuvid --enable-d3d11va --enable-dxva2 --enable-libmfx --enable-nvenc --enable-avisynth --enable-bzlib --enable-fontconfig --enable-frei0r --enable-gnutls --enable-iconv --enable-libass --enable-libbluray --enable-libbs2b --enable-libcaca --enable-libfreetype --enable-libgme --enable-libgsm --enable-libilbc --enable-libmodplug --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenh264 --enable-libopenjpeg --enable-libopus --enable-librtmp --enable-libsnappy --enable-libsoxr --enable-libspeex --enable-libtheora --enable-libtwolame --enable-libvidstab --enable-libvo-amrwbenc --enable-libvorbis --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxavs --enable-libxvid --enable-libzimg --enable-lzma --enable-zlib libavutil 55. 63.100 / 55. 63.100 libavcodec 57. 96.101 / 57. 96.101 libavformat 57. 72.101 / 57. 72.101 libavdevice 57. 7.100 / 57. 7.100 libavfilter 6. 90.100 / 6. 90.100 libswscale 4. 7.101 / 4. 7.101 libswresample 2. 8.100 / 2. 8.100 libpostproc 54. 6.100 / 54. 6.100 [dshow @ 0000000000d36c00] DirectShow video devices (some may be both video and audio devices) [dshow @ 0000000000d36c00] "Logitech HD Pro Webcam C920" [dshow @ 0000000000d36c00] Alternative name "@device_pnp_\\?\usb#vid_046d&pid_082d&mi_00#7&4c735ef&0&0000#{65e8773d-8f56 -11d0-a3b9-00a0c9223196}\{bbefb6c7-2fc4-4139-bb8b-a58bba724083}" [dshow @ 0000000000d36c00] DirectShow audio devices [dshow @ 0000000000d36c00] "Microphone (HD Pro Webcam C920)" [dshow @ 0000000000d36c00] Alternative name "@device_cm_{33D9A762-90C8-11D0-BD43-00A0C911CE86}\wave_{CC06F875-05FB-40A6- 8E75-977962237BDA}" [dshow @ 0000000000d36c00] "Stereo Mix (Realtek High Definition Audio)" [dshow @ 0000000000d36c00] Alternative name "@device_cm_{33D9A762-90C8-11D0-BD43-00A0C911CE86}\wave_{A4989FE2-26C5-4354- 8237-19F262B7BF79}" dummy: Immediate exit requested Regards, -Ron B

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Problems with mpegts and long running stream
by Mathias Schneider 01 Jun '17

01 Jun '17

Hello, I have the following setup: a mpegts stream is built by a gstreamer pipeline and re-muxed by ffmpeg. I want to use the rich feature set of the ffmpeg mpegts-muxer (i.e. fill null-packets into my mpegts stream), therefore I’ve chosen this setup. ffmpeg version: 3.3 (latest static build for Linux from ffmpeg.org) gstreamer version: 1.10 OS: Ubuntu 16.04 Example: Start ffmpeg - it will wait for incoming stream from gstreamer: ffmpeg -re -buffer_size 2560000 -i rtp://127.0.0.1:2335?listen -c copy -muxrate 6000k -f mpegts -mpegts_flags system_b udp://239.200.0.82:1234?pkt_size=1316 Start gstreamer: gst-launch-1.0 -e -m -v videotestsrc is-live=true name=vsource pattern=18 ! videoscale ! videoconvert ! videorate ! video/x-raw,width=1280,height=720,framerate=25/1 ! queue ! videoconvert ! videoscale ! videorate ! x264enc bitrate=5000 threads=0 byte-stream=true key-int-max=50 ! video/x-h264,profile=high ! queue ! h264parse ! mpegtsmux alignment=7 name=strmux ! rtpmp2tpay ! udpsink async=false sync=false host=127.0.0.1 port=2335 Everything works fine for around 1 day - 26,5 hours to be exact. Then, ffmpeg fires a lot of warnings, saying "Non-monotonous DTS in output stream“. The first of these messages gives a hint to the problem: [mpegts @ 0x4f21ba0] Non-monotonous DTS in output stream 0:0; previous: 8584531106, current: -5399886; changing to 8584531107. This may result in incorrect timestamps in the output file. There is a overflow in the mpegts PCR-field (33 bits), I guess. Is there a way to make ffmpeg dealing correctly with this overflow? I’ve already tried the options "-copyts" and "-copytb 1“ - but without success. During my search for a solution, I found this patch here: https://github.com/arut/ffmpeg-patches/blob/master/mpegts-33bit I’ve patched my ffmpeg with it and it seems to solve my issue! Question: Did I something wrong or is there really a problem inside ffmpeg mpegts for long duration streams? And is this patch a correct solution? Thanks, Mathias

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