May 2016 - ffmpeg-user - lists.ffmpeg.org

After demuxing 50i = 50p (...I think...)
by Hornung, Bastian 03 May '16

03 May '16

Hey guys, I have stumbled upon some weird problem, and I'm not sure how to solve it. Actually I'm also not sure if I really have identified the problem, but I think it's the most likely one. So I have some video, MPEG2 video, LPCM16 audio, MP4 container, recorded in 1920 * 1080, 50i (shows up as 25 in VLC). Since this is apparently an invalid combination (according to specifications, and Adobe Premiere 2015 doesn't import it; CS6 does, but I don't have that available anymore), I'm trying to convert the audio into WMAV2 (that seems to work; there are other problems with other codes), but leave the video as it is, and change the container to AVI (because Premiere apparently also has some problems with MP4). The command (on ffmpeg 3.0.1, Ubuntu 14.04): ffmpeg -i /input/F131_1873_01.MP4 -c:v copy -map 0 -c:a wmav2 /input/F131_1873_01_converted_video_copy_audio_wmav2_default.avi The resulting video plays fine in VLC, but the metadata suddenly says 50 fps instead of 25 fps before. This results to problems in Adobe Premiere, which now actually plays it in 50 fps (sound is fine though). If I use -r 25 in the conversion to fix the frame rate, the video itself will get blurry. So somehow, after demuxing, my 50i video is recognized as 50p (....right....? I'm not a professional in videos, maybe I'm misinterpreting the problem). Has anyone stumbled upon this before, and if so, how can I fix this? Thanks guys :), Bastian

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Video Engineer Career Opportunity in Toronto
by Stephen Perry 03 May '16

03 May '16

*Job Description:* Our client is looking for an Senior Engineer to own and lead its efforts to make its video streaming platform reliable, adaptive to varying network conditions, and as high quality as possible. A great candidate will be comfortable contributing to both the client and server. You will bring knowledge of video codecs and media streaming, and also be happy to learn new things and help improve any part of the system. Hot Job Facts: ● Free on-site breakfast and fully-stocked kitchen with snacks, pop and more! ● Fast-paced environment using cutting edge technology ● Flexible working hours Responsibilities: ● Measuring performance and call quality at a deep level, and using that as a yardstick against which we measure progress. ● Optimizing the client library to improve streaming performance and reduce latency. ● In conjunction with the software development teams, you will create video scripts that can be seamlessly integrated into existing software ● Developing techniques to improve reliability and quality on all platforms, including mobile. Required Experience & Skills: ● Previous experience developing and optimizing real time video streaming systems. ● Have worked directly with media and video codecs (e.g., MPEG2TS, MPEG2 video, H.264, H.264, AAC), and know how the codecs work, what their limitations are, and how best to utilize them in a real-time system. ● Experience working in a UNIX/Linux environment, and strong scripting skills ● Multiscreen, VOD and/or IPTV systems experience ● Degree in Computer Science or Electrical Engineering ***NOTE: All applicants MUST be authorized to work in Canada. Any applicants not meeting this criteria will not be notified and will not be considered eligible for the position. *** *Stephen Perry, Sr. I.T. Recruiter *| *TAL Technology* 69 Yonge Street, Suite 1100 | Toronto, Ontario M5E 1K3 Phone: 416.599.1825 ext. 223 Fax: 416.599.8251 Toll Free: 1.877.503.2464 ext. 223 www.talgroup.net <http://www.facebook.com/TALGroupInc> <http://t.sidekickopen06.com/e1t/c/5/f18dQhb0S7lC8dDMPbW2n0x6l2B9nMJW7t5XZs8…> <http://t.sidekickopen06.com/e1t/c/5/f18dQhb0S7lC8dDMPbW2n0x6l2B9nMJW7t5XZs8…> *Click here <http://t.sidekickopen06.com/e1t/c/5/f18dQhb0S7lC8dDMPbW2n0x6l2B9nMJW7t5XZs8…> to visit our career page for upcoming events, job postings and more: *

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codec for screencasting
by bernardo araujo rodrigues 03 May '16

03 May '16

I'm trying to record some screencasts for my openframeworks+kinect pointcloud project. Most of the codec's I'm trying give me poor results, mainly because most information in my video are small white points over a black background. I've tried h264, mpeg4, among others. I've also tried rawvideo and other uncompressed codecs, but few seconds rapidly build up to many Gb of file size, so that is also not an option. Anyone can help?

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ffmpage win7 screen record cursor is abnormal
by Ni Wesley 03 May '16

03 May '16

Hi guys, I hit a problem when recording screen on window 7 using ffmpeg. Snapshot here: [image: enter image description here] <http://i.stack.imgur.com/GpDCV.png> So, you guys see the big red point is recorded mouse cursor. I am using PPT's default pencil, so, actually, cursor is a very small point. But it becomes so big when play. Command I use: ffmpeg.exe -y -rtbufsize 500M -f gdigrab -framerate 5 -draw_mouse 1 -i desktop -f dshow -i audio=%s -af "highpass=f=200, lowpass=f=3000" -c:v libx264 -r 5 -preset medium -tune zerolatency -crf 35 -pix_fmt yuv420p -c:a libvo_aacenc -ac 2 -b:a 48k -fs 50M -movflags +faststart Anyone hit this before? Thanks.

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screen_capture_recorder to record 2nd monitor
by Tim Hiles 03 May '16

03 May '16

I use exactly what they suggest on the screen_capture_recorder ffmpeg faq to record desktop. ffmpeg.exe -f dshow -i video="screen-capture-recorder":audio=%Device% -vcodec libx264 -pix_fmt yuv420p -preset ultrafast -acodec pcm_s16le -ac 1 -ar 22050 -t %Duration% out.mkv works fine. But it records everything. I specifically only want to record what's on the 2nd monitor. Windows 7 64 bit. Anyone have any ideas?

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Video with Multi-channel audio, How to Stream?
by Karl E. Fitzke 02 May '16

02 May '16

Hello, I am creating derivative files from a number of videos captured as one stream of four channels, but which only one pair (1&2 or 3&4) should really play at any given time. I imagined that restreaming 1 stream of four channels to two stereo streams was the way to go, but now I'm second guessing myself having encountered at least one situation where those two streams seem to be being mixed to two channels upon playback, which is not what I want to happen. So I'm looking for guidance on how to structure the data. Seems like the answer may be different based on what format of video file and/or player(s) are expected for use. I imagine creating derivatives as we have with our video with 2-channel audio, similar to the commands below but perhaps with more explicit control over audio streams/channels. ffmpeg -i input.mov -b:v 3000k -c:v mpeg4 -c:a libvo_aacenc output.mp4 ffmpeg -i input.mov -b:v 7000k -c:v prores -c:a libvo_aacenc output_7000k.mov ffmpeg - i input.mov -b:v 7000k -c:v msmpeg4v2 -c:a mp3 output_7000k.avi I'd appreciate any advice and/or links to reference material anyone chooses to send my way! The answers may not be straightforward, so even questions to ask myself will be greatly appreciated. Karl Fitzke

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Divide one Four-Channel Stream into Two Stereo Streams
by Karl E. Fitzke 02 May '16

02 May '16

Finally getting back to a task I got called away from months ago... Trying to divide Stream of 4 channel audio in a video to 2 stereo streams. Does anyone see what might be going wrong here? I instead get one stereo stream and one four channel stream. I'd bring ffmpeg up to the latest version, but I want to finish one job before I do that if I can. lib-6043-1:FourChannelTest dmgvideoadmin$ ffmpeg -i ShortFourChanCaygill.mov -c:v copy -c:a pcm_s16le -map 0:0 -map 0:1 -filter:a:0 "pan=stereo|c0=c0|c1=c1" -map 0:1 -filter:a:0 "pan=stereo|c0=c2|c1=c3" TwoStereo.mov ffmpeg version 2.6.3 Copyright (c) 2000-2015 the FFmpeg developers built with Apple LLVM version 6.1.0 (clang-602.0.53) (based on LLVM 3.6.0svn) configuration: --prefix=/usr/local/Cellar/ffmpeg/2.6.3 --enable-shared --enable-pthreads --enable-gpl --enable-version3 --enable-hardcoded-tables --enable-avresample --cc=clang --host-cflags= --host-ldflags= --enable-libx264 --enable-libmp3lame --enable-libvo-aacenc --enable-libxvid --enable-vda libavutil 54. 20.100 / 54. 20.100 libavcodec 56. 26.100 / 56. 26.100 libavformat 56. 25.101 / 56. 25.101 libavdevice 56. 4.100 / 56. 4.100 libavfilter 5. 11.102 / 5. 11.102 libavresample 2. 1. 0 / 2. 1. 0 libswscale 3. 1.101 / 3. 1.101 libswresample 1. 1.100 / 1. 1.100 libpostproc 53. 3.100 / 53. 3.100 Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'ShortFourChanCaygill.mov': Metadata: major_brand : qt minor_version : 512 compatible_brands: qt encoder : Lavf56.25.101 Duration: 00:00:30.03, start: 0.000000, bitrate: 226800 kb/s Stream #0:0(eng): Video: v210 (v210 / 0x30313276), yuv422p10le, 720x486, 223725 kb/s, SAR 9:10 DAR 4:3, 29.97 fps, 29.97 tbr, 30k tbn, 30k tbc (default) Metadata: handler_name : DataHandler encoder : Uncompressed 10-Bit YUV timecode : 00:00:00;00 Stream #0:1(eng): Audio: pcm_s16le (sowt / 0x74776F73), 48000 Hz, 4.0, s16, 3072 kb/s (default) Metadata: handler_name : DataHandler Stream #0:2(eng): Data: none (tmcd / 0x64636D74), 0 kb/s Metadata: handler_name : DataHandler timecode : 00:00:00;00 [Parsed_pan_0 @ 0x7ff142d01a80] Pure channel mapping detected: 2 3 Output #0, mov, to 'TwoStereo.mov': Metadata: major_brand : qt minor_version : 512 compatible_brands: qt encoder : Lavf56.25.101 Stream #0:0(eng): Video: v210 (v210 / 0x30313276), yuv422p10le, 720x486 [SAR 9:10 DAR 4:3], q=2-31, 223725 kb/s, 29.97 fps, 29.97 tbr, 30k tbn, 30k tbc (default) Metadata: handler_name : DataHandler encoder : Uncompressed 10-Bit YUV timecode : 00:00:00;00 Stream #0:1(eng): Audio: pcm_s16le (sowt / 0x74776F73), 48000 Hz, stereo, s16, 1536 kb/s (default) Metadata: handler_name : DataHandler encoder : Lavc56.26.100 pcm_s16le Stream #0:2(eng): Audio: pcm_s16le (sowt / 0x74776F73), 48000 Hz, 4.0, s16, 3072 kb/s (default) Metadata: handler_name : DataHandler encoder : Lavc56.26.100 pcm_s16le Stream mapping: Stream #0:0 -> #0:0 (copy) Stream #0:1 -> #0:1 (pcm_s16le (native) -> pcm_s16le (native)) Stream #0:1 -> #0:2 (pcm_s16le (native) -> pcm_s16le (native)) Press [q] to stop, [?] for help frame= 900 fps=805 q=-1.0 Lsize= 837028kB time=00:00:30.01 bitrate=228427.7kbits/s video:820125kB audio:16885kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 0.002192% Karl Fitzke Audio/Visual Specialist B76 Kroch Library Ithaca, NY 14853 607-255-5521 karl.fitzke(a)cornell.edu

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error Could not write header for output file #0 (incorrect codec parameters ?): Invalid argument
by juan carlos Rebate 01 May '16

01 May '16

documentation once again conspicuous by its absence, I find by google nngun another place to talk about this error Could not write header for output file #0 (incorrect codec parameters ?): Invalid argument my imput is: ffmpeg -i imput.avi -c copy -f mp4 -listen 1 http://localhost:80

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