March 2017 - ffmpeg-user - lists.ffmpeg.org

Stream from a dynamic collection
by Jorge Reyero 02 Mar '17

02 Mar '17

Hi, I'm new using ffmpeg so I don't know if what I want is possible or not, I hope you can tell. I have a video collection (place in the server filesystem) which is growing every minute. I want to simulate a live stream from this video collection and if the stream reaches the end of the videos it should start form the first one again. I know how to repeat a single video and how to play videos from static video collection but I have no idea how do it with this dynamic collection. Any idea? Is it possible to do that? Thanks

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Difference in ffmpeg command execution time
by Vivek Jain 01 Mar '17

01 Mar '17

Hi, On trying to create video using ffmpeg as per command below, it takes much more time (around 6 minutes) on AWS lambda and EC2 instances where as it takes just 2 minutes on my local mac. I understand run time differs on CPU, but I am not able to figure out what needs to be done in order to get it run within 5 minutes on lambda. Or it could be due to differences in or missing libraries. Could someone please point me in right direction? Command: ffmpeg -safe 0 -f concat -i /tmp/config.txt -i /tmp/audio.mp3 -y -pix_fmt yuv444p -shortest /tmp/out_ffff.mp4 Attached are the logs of both the machines. -- Thanks, Vivek

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CodecPrivateData is empty when h264_vaapi encoder used
by w_boba 01 Mar '17

01 Mar '17

I am trying to use new CPU with VA-API enabled h264 encoder on FFmpeg (ffmpeg version n3.2.4-4-g36fff6c). I have no issues encoding "offline" files with h264_vaapi encoder, but when I try to encode live streams and push output to SmoothStream server (using ISMV muxer) new streams do not work. Exactly same configuration works fine with libx264 encoder. So far I figured that after libx264 encoder ffmpeg correctly sets "CodecPrivateData" field data but h264_vaapi sends empty data field. Old command line (works fine): ffmpeg -y -i "udp://235.1.1.136:392" -g 30 -r ntsc -movflags isml+frag_keyframe -sc_threshold 0 -c:v libx264 -c:a aac -ac 2 -b:a 128k -b:v 3072k -f ismv "http://10.100.1.14/testenc1.isml/Streams(testenc1)" New command line (encoding works, but streams do not play): ffmpeg -y -vaapi_device /dev/dri/renderD128 -i "udp://235.1.1.136:392" -vf 'format=nv12,hwupload' -g 30 -r ntsc -movflags isml+frag_keyframe -sc_threshold 0 -c:v h264_vaapi -c:a aac -ac 2 -b:a 128k -b:v 3072k -f ismv "http://10.100.1.14/testenc1.isml/Streams(testenc1)" -- View this message in context: http://www.ffmpeg-archive.org/CodecPrivateData-is-empty-when-h264-vaapi-enc… Sent from the FFmpeg-users mailing list archive at Nabble.com.

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