Re: [FFmpeg-user] New and question with -i option
On 09-07-2020 02:50 pm, François-Marie BILLARD wrote: Hello, i'm new on this list and would use ffmpeg for making a video from pictures. I have used this command line; with 54 pictures from DSC_0527.JPG : ffmpeg -f image2 -i DSC_05%2d.JPG -start_number 0527 -r 12 -vcodec mpeg4 -b 15000k ouverture_four.mp4 i have this error, when i launch the command in the directory with the pictures : [image2 @ 0x55b7146af8c0] Could find no file with path 'DSC_05%2d.JPG' and index in the range 0-4 DSC_05%2d.JPG: No such file or directory It should be ffmpeg -f image2 -start_number 27 -i DSC_05%2d.JPG -r 12 -vcodec mpeg4 -b 15000k ouverture_four.mp4 `-start_number` qualifies the input so it belongs before the corresponding input `-i` In ` DSC_05%2d`, 05 is a literal and so not recognized as part of the numbering pattern. Also, `-r 12` will cause ffmpeg to drop 13 out of every 25 images, since ffmpeg assumes a default frame rate of 25 for image sequences. You can override it by adding -framerate 12 for this input. (And then drop -r 12) ffmpeg -f image2 -start_number 27 -framerate 12 -i DSC_05%2d.JPG -c:v mpeg4 -b:v 15000k ouverture_four.mp4 Gyan ___ ffmpeg-user mailing list ffmpeg-user@ffmpeg.org https://ffmpeg.org/mailman/listinfo/ffmpeg-user To unsubscribe, visit link above, or email ffmpeg-user-requ...@ffmpeg.org with subject "unsubscribe".
[FFmpeg-user] New and question with -i option
Hello, i'm new on this list and would use ffmpeg for making a video from pictures. I have used this command line; with 54 pictures from DSC_0527.JPG : ffmpeg -f image2 -i DSC_05%2d.JPG -start_number 0527 -r 12 -vcodec mpeg4 -b 15000k ouverture_four.mp4 i have this error, when i launch the command in the directory with the pictures : [image2 @ 0x55b7146af8c0] Could find no file with path 'DSC_05%2d.JPG' and index in the range 0-4 DSC_05%2d.JPG: No such file or directory thank's for your help -- François-Marie ___ ffmpeg-user mailing list ffmpeg-user@ffmpeg.org https://ffmpeg.org/mailman/listinfo/ffmpeg-user To unsubscribe, visit link above, or email ffmpeg-user-requ...@ffmpeg.org with subject "unsubscribe".
Re: [FFmpeg-user] Compiling on an aarch64 machine
On Thu, Jul 09, 2020 at 10:16:29 +0200, Verachten Bruno wrote: > The fact that FFMpeg does not compile without this trick of exporting an > empty CFLAGS variable on aarch64 there: https://trac.ffmpeg.org/ . > If you consider this is not a bug, that's perfect for me, but in my point > of view, that should be written somewhere... If not in FFMpeg > documentation, I'll write it down in a blog post. Any autotools (autoconf/configure) based tool will also take a CFLAGS environment into consideration. Those tools will also likely not build with your environment. Good luck opening 300,000[*] bug tickets. ;-) (Note: ffmpeg is not autoconf based.) Why would you even export this variable, if your compiler doesn't support it? Moritz [*] Wild guesstimate. ___ ffmpeg-user mailing list ffmpeg-user@ffmpeg.org https://ffmpeg.org/mailman/listinfo/ffmpeg-user To unsubscribe, visit link above, or email ffmpeg-user-requ...@ffmpeg.org with subject "unsubscribe".
Re: [FFmpeg-user] Compiling on an aarch64 machine
> Could this behaviour be considered as a bug? If so, I can file it. > What would you like to report where? > The fact that FFMpeg does not compile without this trick of exporting an empty CFLAGS variable on aarch64 there: https://trac.ffmpeg.org/ . If you consider this is not a bug, that's perfect for me, but in my point of view, that should be written somewhere... If not in FFMpeg documentation, I'll write it down in a blog post. Thanks. -- Bruno Verachten ___ ffmpeg-user mailing list ffmpeg-user@ffmpeg.org https://ffmpeg.org/mailman/listinfo/ffmpeg-user To unsubscribe, visit link above, or email ffmpeg-user-requ...@ffmpeg.org with subject "unsubscribe".
[FFmpeg-user] Virtual camera
I was wondering if there is any way to use FFmpeg to create a virtual camera for a PC/Mac from an H264 stream source. I know FFmpeg can use directshow as an input device. Thanks, Simon ___ ffmpeg-user mailing list ffmpeg-user@ffmpeg.org https://ffmpeg.org/mailman/listinfo/ffmpeg-user To unsubscribe, visit link above, or email ffmpeg-user-requ...@ffmpeg.org with subject "unsubscribe".
Re: [FFmpeg-user] Virtual camera
Simon Brown (12020-07-09): > I was wondering if there is any way to use FFmpeg to create a virtual > camera for a PC/Mac from an H264 stream source. I know FFmpeg can use > directshow as an input device. No, FFmpeg cannot do that. You may be able to achieve that with the vivid video driver: https://www.kernel.org/doc/html/v4.12/media/v4l-drivers/vivid.html and use ffmpeg to feed it, but I have not managed to get it to work. Not a FFmpeg issue. Regards, -- Nicolas George signature.asc Description: PGP signature ___ ffmpeg-user mailing list ffmpeg-user@ffmpeg.org https://ffmpeg.org/mailman/listinfo/ffmpeg-user To unsubscribe, visit link above, or email ffmpeg-user-requ...@ffmpeg.org with subject "unsubscribe".
Re: [FFmpeg-user] Virtual camera
On 7/9/2020 6:10 AM, Nicolas George wrote: Simon Brown (12020-07-09): I was wondering if there is any way to use FFmpeg to create a virtual camera for a PC/Mac from an H264 stream source. I know FFmpeg can use directshow as an input device. No, FFmpeg cannot do that. You may be able to achieve that with the vivid video driver: https://www.kernel.org/doc/html/v4.12/media/v4l-drivers/vivid.html and use ffmpeg to feed it, but I have not managed to get it to work. Not a FFmpeg issue. Regards, ___ ffmpeg-user mailing list ffmpeg-user@ffmpeg.org https://ffmpeg.org/mailman/listinfo/ffmpeg-user To unsubscribe, visit link above, or email ffmpeg-user-requ...@ffmpeg.org with subject "unsubscribe". this virtual device is working with ffmpeg https://github.com/umlaeute/v4l2loopback ___ ffmpeg-user mailing list ffmpeg-user@ffmpeg.org https://ffmpeg.org/mailman/listinfo/ffmpeg-user To unsubscribe, visit link above, or email ffmpeg-user-requ...@ffmpeg.org with subject "unsubscribe".
[FFmpeg-user] Solved : Re: New and question with -i option
thank's all is fine now François-marie Le 09/07/2020 à 11:38, Gyan Doshi a écrit : On 09-07-2020 02:50 pm, François-Marie BILLARD wrote: Hello, i'm new on this list and would use ffmpeg for making a video from pictures. I have used this command line; with 54 pictures from DSC_0527.JPG : ffmpeg -f image2 -i DSC_05%2d.JPG -start_number 0527 -r 12 -vcodec mpeg4 -b 15000k ouverture_four.mp4 i have this error, when i launch the command in the directory with the pictures : [image2 @ 0x55b7146af8c0] Could find no file with path 'DSC_05%2d.JPG' and index in the range 0-4 DSC_05%2d.JPG: No such file or directory It should be ffmpeg -f image2 -start_number 27 -i DSC_05%2d.JPG -r 12 -vcodec mpeg4 -b 15000k ouverture_four.mp4 `-start_number` qualifies the input so it belongs before the corresponding input `-i` In ` DSC_05%2d`, 05 is a literal and so not recognized as part of the numbering pattern. Also, `-r 12` will cause ffmpeg to drop 13 out of every 25 images, since ffmpeg assumes a default frame rate of 25 for image sequences. You can override it by adding -framerate 12 for this input. (And then drop -r 12) ffmpeg -f image2 -start_number 27 -framerate 12 -i DSC_05%2d.JPG -c:v mpeg4 -b:v 15000k ouverture_four.mp4 Gyan ___ ffmpeg-user mailing list ffmpeg-user@ffmpeg.org https://ffmpeg.org/mailman/listinfo/ffmpeg-user To unsubscribe, visit link above, or email ffmpeg-user-requ...@ffmpeg.org with subject "unsubscribe". -- François-Marie ___ ffmpeg-user mailing list ffmpeg-user@ffmpeg.org https://ffmpeg.org/mailman/listinfo/ffmpeg-user To unsubscribe, visit link above, or email ffmpeg-user-requ...@ffmpeg.org with subject "unsubscribe".
Re: [FFmpeg-user] write output of find_rect to a file?
> Unfortunately I can't compile ffmpeg myself on my Windows system. If you are comfortable with compiling FFmpeg in general but lack the tools on Windows, you could try the media-autobuild suite. https://github.com/m-ab-s/media-autobuild_suite If you need to recompile FFmpeg you can keep your ffmpeg_options.txt, mpv_options.txt and media-autobuild_suite.ini files to reuse your settings. ___ ffmpeg-user mailing list ffmpeg-user@ffmpeg.org https://ffmpeg.org/mailman/listinfo/ffmpeg-user To unsubscribe, visit link above, or email ffmpeg-user-requ...@ffmpeg.org with subject "unsubscribe".
[FFmpeg-user] replace several lines by one using the filter_complex
Hello, I have a video that I need to extract two parts of it and merge together those parts. I can accomplish this using the TRIM/ATRIM filter together with the concat demuxer: $ ffmpeg -i video.mp4 -vf "trim=start=7:end=1173,setpts=PTS-STARTPTS" -af "atrim=start=7:end=1173,asetpts=PTS-STARTPTS" part1.mp4 $ ffmpeg -i video.mp4 -vf "trim=start=1260:end=1430,setpts=PTS-STARTPTS" -af "atrim=start=1260:end=1430,asetpts=PTS-STARTPTS" part2.mp4 After this I create a file input.txt (duration found with ffprobe): file 'part1.mp4' duration 1166.02file 'part2.mp4'duration 170.02 And finish with $ ffmpeg -f concat -i input.txt -c copy video_final.mp4 This sequence of steps work as expected but I would like to know if it is possible to use the filter_complex with only "one line command" to achieve same result ? Kind regards, Leonardo ___ ffmpeg-user mailing list ffmpeg-user@ffmpeg.org https://ffmpeg.org/mailman/listinfo/ffmpeg-user To unsubscribe, visit link above, or email ffmpeg-user-requ...@ffmpeg.org with subject "unsubscribe".
Re: [FFmpeg-user] replace several lines by one using the filter_complex
On 10-07-2020 01:01 am, Leonardo via ffmpeg-user wrote: $ ffmpeg -i video.mp4 -vf "trim=start=7:end=1173,setpts=PTS-STARTPTS" -af "atrim=start=7:end=1173,asetpts=PTS-STARTPTS" part1.mp4 $ ffmpeg -i video.mp4 -vf "trim=start=1260:end=1430,setpts=PTS-STARTPTS" -af "atrim=start=1260:end=1430,asetpts=PTS-STARTPTS" part2.mp4 After this I create a file input.txt (duration found with ffprobe): file 'part1.mp4' duration 1166.02file 'part2.mp4'duration 170.02 And finish with $ ffmpeg -f concat -i input.txt -c copy video_final.mp4 This sequence of steps work as expected but I would like to know if it is possible to use the filter_complex with only "one line command" to achieve same result ? Yes, using the concat filter. ffmpeg -i video.mp4 -filter_complex "[0:v]trim=start=7:end=1173,setpts=PTS-STARTPTS[v1];[0:v]trim=start=1260:end=1430,setpts=PTS-STARTPTS[v2];[0:a]atrim=start=7:end=1173,asetpts=PTS-STARTPTS[a1];[0:a]atrim=start=1260:end=1430,asetpts=PTS-STARTPTS[a2];[v1][a1][v2][a2]concat=n=2:v=1:a=1" merged.mp4 Gyan ___ ffmpeg-user mailing list ffmpeg-user@ffmpeg.org https://ffmpeg.org/mailman/listinfo/ffmpeg-user To unsubscribe, visit link above, or email ffmpeg-user-requ...@ffmpeg.org with subject "unsubscribe".