December 2020 - ffmpeg-user - lists.ffmpeg.org

ffplay and buffering
by Gianfranco Migliozzi 01 Dec '20

01 Dec '20

Hi all, I'm new on the mailing list. I have to play an RTP h264 stream. I provided a file sdp on the command line and works fine. The problem is a sort of buffering introduced by ffplay (I can see easily the problem playing the stream also with gstreamer). During the streaming by the server, if I stop the server, ffplay doesn't display the last frame received, gstreamer instead show the correct one. Sometimes after some seconds from the stop ffplay updates the image without receiving more data, as for an internal flush, but again the image isn't the last one. I tried some parameters without results: -fflags nobuffer -avioflags direct -rtbufsize 0 Thanks for any pointer.

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Add logo with ffmpeg and obtain livestream link
by carto lover 01 Dec '20

01 Dec '20

Hi i'm new to ffmpeg and it's very promising i want to add a logo to stream video i tested it and obtained an mp4 file and all is fine: ffmpeg -y -i myhttplinkstreaming -i ./logo1.jpeg -filter_complex "overlay=10:10" OUT_1.mp4 if i want to restream it live... is it possible to remove out_1.mp4 and have something like myip:1234?? i tried: ffmpeg -i myhttplink -i logo.png -filter_complex overlay -f mpegts udp://myip:myport [image: Immagine.png] seems that start but if i go on vlc and add udp://myip:myport nothing happens

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-rtsp_transport tcp tag
by USMAN AAMER 01 Dec '20

01 Dec '20

Hi, I am streaming videos over LAN and I want to confirm that either -rtsp_transport TCP tag is used at the server-side command or client-side. Looking forward to the kind response. Thanks

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video overlay scaling issue or am I doing it wrong ?
by neonira Arinoem 01 Dec '20

01 Dec '20

I have a main video named *assembled-video.mp4*, that has size *1058x594* codec H.264 25 fps 57 kbps I want the following three 5 seconds video to be overlaid respectively at time 10s, 70s and 189s. *video-msg01.mp4*, that has size *400x86* codec H.264 25 fps 11 Kbs *video-msg02.mp4*, that has size *400x86* codec H.264 25 fps 11 Kbs *video-msg03.mp4*, that has size *650x86* codec H.264 25 fps 16 Kbs To generate overlay file I used following command lines /code/mylinux/bin/video-utils/mergeMovieIntoMovie.bash assembled-video.mp4 video-msg01.mp4 5 10 400 86 G /code/mylinux/bin/video-utils/mergeMovieIntoMovie.bash assembled-video-merged.mp4 video-msg02.mp4 70 75 400 86 G /code/mylinux/bin/video-utils/mergeMovieIntoMovie.bash assembled-video-merged-merged.mp4 video-msg03.mp4 189 194 650 86 G Find *mergeMovieIntoMovie.bash *as attachment. To make it clear this script takes the background-video as first argument, the video to overlay as second argument, and then start and end time of overlay, and video overlay width and height. The final G is just a flag for verbosity. Mainly this script does ffmpeg -i $MOVIE_FILE -i $INSERT_FILE -s 1054x594 -filter_complex "[0:v][1:v] overlay=0:0:enable='between(t,$3,$4)'" -pix_fmt yuv420p -c:v libx264 -c:a copy $TFN -y This roughly works but there is an annoying issue I am currently unable to understand and solve. First overlay works correctly. Second and third overlays appear twice as big as the first overlay. Got absolutely no clue about the origin of this. Any idea to get a proper result is welcome. Got also some newbie questions or confirmation requests 1. how to get the size of a video using ffmpeg ? 2. Does the bitrate have any importance during overlay ? 3. Is there a smarter way to achieve this result in just one pass? Thanks in advance for suggestions.

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Using GPU with ffmpeg
by madderek＠ntlworld.com 01 Dec '20

01 Dec '20

Hi I'm using ffmpeg to combine a large number of TIFF files into a single video. The TIFFs are the result of upscaling videos. They are large in number, typically 20000 or 30000. The process is slow. Is there a simple way of using the GPU ram? I have a NVIDIA 2080 TI with 11GBof RAM. Derek Clements

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