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

Can't cut on some frames number
by Mark Conrad 30 Oct '18

30 Oct '18

I am trying to cut on specific frame numbers but this does not seem to work. The 10th frame of the clip I am working is would be 00:00:0.416667 since the video is 24 fps. When I run [ffmpeg "my_video.mp4" -ss 00:00:0.416667 -to 00:00:1.208333 "my_clipped_video.mp4] I lose the 10th frame and my clip starts on the 11th frame. I seem to notice this with ms that end in repeating numbers so how do you clip on a exact frame? I have a example of my code here in python: https://stackoverflow.com/questions/53055988/losing-frames-when-clipping-vi… -- Mark Conrad Pipeline Technical Director *Aquamen Entertainment LLC* 6555 Barton Avenue, Suite 100 LA, CA 90038 -- *Aquamen Entertainment LLC.* Confidentiality Notice: This email and any files transmitted with it are confidential and intended solely for the use of the individual or entity to whom they are addressed. If you have received this email in error please notify the system manager. This message contains confidential information and is intended only for the individual named. If you are not the named addressee you should not disseminate, distribute or copy this e-mail. Please notify the sender immediately by e-mail if you have received this e-mail by mistake and delete this e-mail from your system. If you are not the intended recipient you are notified that disclosing, copying, distributing or taking any action in reliance on the contents of this information is strictly prohibited.

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How to concatenate multiple ts files into one fmp4 file
by qw 29 Oct '18

29 Oct '18

hi, I have one question about fragmented mp4. There are many ts files with different a/v encoding setting. I want to concatenate those ts files together into one fmp4 file without retranscoding. How to do that? Thanks! Regards Andrew

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ffmpeg hang in background
by sailor-godkane 29 Oct '18

29 Oct '18

Hello, I am using ffmpeg in a big project for video/audio automated processing. Each project for processing requires lots of ffmpeg commands. Those commands are run by a daemon written in ObjC using GnuStep. Since it runs on the background i used -nostdin and -loglevel quiet for production use. To be sure i read everything on stdout and stderr to /dev/null but it should not matter since the command does not output anything. Everything run fine except sometimes a ffmpeg command will hang and i cannot understand why. Sometimes i can see a few % of cpu used by the commands but after hours it was still there. When it happens i have to shutdown my daemon and restart the processing. The same command will then run fine and the process can be finished. Details of ffmpeg (compiled from source) ffmpeg version n4.0.2 Copyright (c) 2000-2018 the FFmpeg developers built with gcc 4.8 (SUSE Linux) configuration: --disable-programs --enable-ffprobe --enable-ffmpeg --enable-libx264 --enable-gpl --enable-shared --enable-pthreads --enable-libmp3lame --enable-pic libavutil 56. 14.100 / 56. 14.100 libavcodec 58. 18.100 / 58. 18.100 libavformat 58. 12.100 / 58. 12.100 libavdevice 58. 3.100 / 58. 3.100 libavfilter 7. 16.100 / 7. 16.100 libswscale 5. 1.100 / 5. 1.100 libswresample 3. 1.100 / 3. 1.100 libpostproc 55. 1.100 / 55. 1.100 System is : openSUSE 13.1 - 3.11.10-29-desktop The machine is a virtual one running on VMWare. The command that most often hangs is ffmpeg -nostdin -loglevel quiet -y -i front_slide_video.mov -an -r 16.000000 -c:v libx264 -preset slow -b:v 5000k -aspect 1.333333 -vf scale=640:480,pad=640:480:0:0:black front_slide_video-rescaled.mov But i had other commands hanging randomly as well so this is just a sample. Since this is completely random i have no way of testing it. The command that hang works fine if i run it manually and it runs fine most of the time when the daemon runs it. I upgraded from a version 2.X that was running on the previous major version of my software. It's been a few years since i worked on it but i don't recall hangs back in the day with version 2. I had the same problem with 4.0.1 btw. Thanks for your help -- Sent from: http://www.ffmpeg-archive.org/

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Decoding adpcm_psx
by Markus Laaja 28 Oct '18

28 Oct '18

Greetings. In short, I'm running into constant input errors when trying to decode from different adpcm formats. Compiling ffmpeg on a linux environment to see if it helps, is way beyond my reach just to solve this, unfortunately. Can anyone confirm this shouldn't happen? Thanks for everyone in advance. The input and output cut short: D:\ffmpeg-4.0.2-win32-static\bin>ffmpeg -f adpcm_psx -ar 22050 -ac 1 -i ST1.adpcm_psx ST1.wav ffmpeg version 4.0.2 Copyright (c) 2000-2018 the FFmpeg developers built with gcc 7.3.1 (GCC) 20180722 libavutil 56. 14.100 / 56. 14.100 libavcodec 58. 18.100 / 58. 18.100 libavformat 58. 12.100 / 58. 12.100 libavdevice 58. 3.100 / 58. 3.100 libavfilter 7. 16.100 / 7. 16.100 libswscale 5. 1.100 / 5. 1.100 libswresample 3. 1.100 / 3. 1.100 libpostproc 55. 1.100 / 55. 1.100 Unknown input format: 'adpcm_psx' --- It's the same with other adpcm formats, it seems. D:\ffmpeg-4.0.2-win32-static\bin>ffmpeg -f adpcm_xa -i ST1.adpcm_psx ST1.wav Unknown input format: 'adpcm_xa' Unknown input format: 'adpcm_ms' Unknown input format: 'adpcm_yamaha'

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Ffmpeg compilation issues
by Ronak 28 Oct '18

28 Oct '18

Hi all, I'm trying to build the latest HEAD version of Ffmpeg on Linux on the following platform. Linux 4.9.124-0.1.ac.198.71.329.metal1.x86_64 #1 SMP Thu Aug 30 20:39:05 UTC 2018 x86_64 x86_64 x86_64 GNU/Linux But, I'm getting compilation problems: libavcodec/v4l2_m2m_enc.c: In function ‘v4l2_set_ext_ctrl’: libavcodec/v4l2_m2m_enc.c:51: warning: braces around scalar initializer libavcodec/v4l2_m2m_enc.c:51: warning: (near initialization for ‘ctrls.count’) libavcodec/v4l2_m2m_enc.c:55: error: ‘struct v4l2_ext_controls’ has no member named ‘ctrl_class’ libavcodec/v4l2_m2m_enc.c:60: error: ‘struct v4l2_ext_control’ has no member named ‘value’ libavcodec/v4l2_m2m_enc.c: In function ‘v4l2_get_ext_ctrl’: libavcodec/v4l2_m2m_enc.c:71: warning: braces around scalar initializer libavcodec/v4l2_m2m_enc.c:71: warning: (near initialization for ‘ctrls.count’) libavcodec/v4l2_m2m_enc.c:76: error: ‘struct v4l2_ext_controls’ has no member named ‘ctrl_class’ libavcodec/v4l2_m2m_enc.c:89: error: ‘struct v4l2_ext_control’ has no member named ‘value’ make: *** [libavcodec/v4l2_m2m_enc.o] Error 1 It looks like Ffmpeg is not finding the correct unions in the file: /usr/include/linux/videodev2.h. What do I have to set to make compilation succeed? Thanks, Ronak

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Cannot receive audio/video from Unreal WebRTC DirectShow Source filter
by Maxim Ershtein 27 Oct '18

27 Oct '18

Hello, I am trying to record VP9/Opus -encoded live stream into .mkv file. The live stream is being encoded by Chrome browser and sent via WebRTC to Unreal Media Server. Unreal Media Server allows installing WebRTC DirectShow Source filter: http://umediaserver.net/components/index.html This filter allows connecting to Unreal Media Server and receiving the original stream. It works fine in GraphEdit - I can render and play the stream. But my goal is to record it with ffmpeg to .mkv file with no transcoding. So I am doing: *ffmpeg -f dshow -show_video_device_dialog true -i video="Unreal WebRTC Client Source":audio="Unreal WebRTC Client Source" -c:a copy -c:v copy c:\temp\output.mkv* According to documentation, it should work. Notice that I am doing *-show_video_device_dialog true* This is because you need to initialize the filter, like all Unreal source filters, with the URL where to pull the stream from. This URL is not getting persisted anywhere, so each time you instantiate this filter, you need to initialize it with the URL. So the dialog allows you to input the URL. But when I do it, ffmpeg reports *"Could not get media type"*. *What am I doing wrong?* Again, using the same dialog in GraphEdit works fine and I can render pins and play. I am also looking for some automation of that dialog - how do I pass that URL to the filter using command line? The filter readme says: "Configuration parameters can be provided via property page or via IFileSourceFilter interface exposed by the filter. When configured via IFileSourceFilter interface, initialization string needs to be provided as first parameter of IFileSourceFilter::Load() method." So, I guess, ffmpeg could check if IFileSourceFilter interface is supported and then call a Load function with command line - supplied parameter. If ffmpeg doesn't support that, any ideas on how to pass the URL to the filter programmatically? Note that this is a pretty generic situation - I might have 10 ffmpeg instances loading this filter and each one is going to use a different URL. So the URL is not something static and cannot sit in registry or some config file. So same problem with other network source filters from Unreal, but I don't need others, as ffmpeg can receive rtsp, rtmp and mpeg-ts streams by itself. But ffmpeg, of course, cannot receive browser-encoded WebRTC streams with VP9/Opus encodings. Hence I am trying to use Unreal WebRTC DirectShow Source filter.

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Re: [FFmpeg-user] YUV RGB Video Levels
by Chris 26 Oct '18

26 Oct '18

Depending on the primaries, it is possible to have YUV values which imply illegal RGB values, which may be what's being discussed here. That's what I'm trying to fix with ffmpeg :) -----Original Message----- From: Phil Rhodes <phil_rhodes-at-rocketmail.com(a)ffmpeg.org> To: FFmpeg user questions <ffmpeg-user(a)ffmpeg.org> Sent: Wed, Oct 24, 2018 3:41 am Subject: Re: [FFmpeg-user] YUV RGB Video Levels >> I have a YUV video file which must pass EBU r103. The RGB >> components must be above 0 and less than 255. > (I probably misunderstand but I would have assumed that it is > technically impossible to output values that are not within > these boundaries.) Depending on the primaries, it is possible to have YUV values which imply illegal RGB values, which may be what's being discussed here. P _______________________________________________ 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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Will ffmpeg always use the existing orig.parameters when no new are specified on cmdline for re-encoding?
by Ben 26 Oct '18

26 Oct '18

Assume I have an original video file (AVI, MP4 or MKV). I want to re-encode it to a new (lower) video bitrate. When I enter at the command line a ffmpeg command and specify (beside input and output file name) only the new video bitrate: Will ffmpeg ALWAYS automatically take the remaining parameters from the existing video? In otehr words: Will e.g. the frames per second, the max keyframe interval, the resolution, the audio bitrate and codec always be the same as the original? If not: Can I tell ffmpeg explicitely, manually to use them? Similar to ffmpeg.exe -i .... -b:v 2200k -useotherparmsfrominput ...... Ben

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Parameters for "framerate" and "keyframe interval"?
by Ben 26 Oct '18

26 Oct '18

For video codec H.264 there are two parameters: Framerate (e.g. 25 or 30 or 29,97) and keyframe interval (I guess measured in seconds after the last keyframe .e.g 50 or 200): What are the corresponding cmdline parameters for ffmpeg? How can I tell ffmpeg to use the same values as the input? Thank you Ben

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How to display Close Caption on the screen
by Erik Gaudin 25 Oct '18

25 Oct '18

When i open our internal stream with VLC, i can displayed Substitle. But can't find how to do it with ffplay.exe (windows) ffplay udp://@239.255.123.1:1234 -analyzeduration 200 I use the last argument for low latency. Here what appear in DOS when start FFPLAY with URL only : Input #0, mpegts, from 'udp://@239.255.179.6:5000':q= 0B f=0/0 Duration: N/A, start: 86892.634178, bitrate: N/A Program 2672 Stream #0:0[0xa72]: Video: hevc (Main) ([36][0][0][0] / 0x0024), yuv420p(tv), 1280x720 [SAR 1:1 DAR 16:9], Closed Captions, 59.94 fps, 59.94 tbr, 90k tbn, 59.94 tbc Stream #0:1[0xa73](eng): Audio: aac_latm (LC) ([17][0][0][0] / 0x0011), 48000 Hz, stereo, fltp Stream #0:2[0xa74](fre): Audio: aac_latm (LC) ([17][0][0][0] / 0x0011), 48000 Hz, stereo, fltp In VLC, CC are in Flux # 3 (Flux 0 = video, Flux 1 & 2 Audio track) Erik Gaudin Chef de projet Société Radio-Canada (SRC) Ingénierie Médias (Montréal) Project Leader Canadian Broadcasting Corporation (CBC) Media Engineering (Montreal) Tél. : 514-597-6586 (1-141-6586) Cell. : 514-895-6586

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