I am using ffmpeg 0.11.1 onto a panda board for streaming. Linux linaro-developer 3.4.0-1-linaro-lt-omap #1~120625232503-Ubuntu Sx Ubuntu os.
I want to live stream a raw video from a video device or a cam to a rtmp server in an mp4 format, command used:
./ffmpeg \
-f alsa -async 1 -ac 2 -i hw:2,0 \
-f video4linux2 -i /dev/video0 \
-acodec aac -b:a 40k \
-r 50 -s 320x240 -vcodec libx264 -strict -2 -b:v 320K -pass 1 \
-f flv rtmp://...../mp4:demo101
By this command I am able to stream but fps varies between 8 to 7 6 and so on. Help me to figure it out.
Related
I have try stream with ffmpeg with output to differents rtmp servers like that
ffmpeg -re -i nameoffile.mp4 -vcodec libx264 -g 60 -c:a aac -b:a 160k -ar 44100 -strict -2 -f flv \
-f flv rtmp://rtmp.1.com/code \
-f flv rtmp://rtmp.2.com/code \
-f flv rtmp://rtmp.3.com/code \
-f flv rtmp://rtmp.4.com/code \
-f flv rtmp://rtmp.5.com/code \
The problem is... is working only the first one but not the others
You have to set the output options for each output: -vcodec libx264 -g 60 -c:a aac -b:a 160k -ar 44100
I have this ffmpeg script I'm running to automatically convert videos to instagram's accepted coded
The script looks like this:
ffmpeg -analyzeduration 20M -probesize 20M -y -re -f lavfi -i "movie=filename='file.mp4':loop=5, setpts=N/(FRAME_RATE*TB)" -vcodec libx264 -b:v 3500k -vsync 2 -t 59 -acodec aac -b:a 128k -pix_fmt yuv420p -vf "scale=1080:1080:force_original_aspect_ratio=decrease,pad=1080:1080:(ow-iw)/2:(oh-ih)/2:white" -crf 24 new_file.mp4
However that seems to cut out the audio, and I can't seem to find out how to prevent that? I didn't use any -an or anything, and when messing around the audio keeps being cut out? Any idea why?
The movie filter, by default, only reads one video stream from the input.
For looping, stream_loop is available without having to use filters.
ffmpeg -analyseduration 20M -probesize 20M -y -re -stream_loop 5 -i "file.mp4" -vcodec libx264 -b:v 3500k -vsync cfr -t 59 -acodec aac -b:a 128k -pix_fmt yuv420p -vf "scale=1080:1080:force_original_aspect_ratio=decrease,pad=1080:1080:(ow-iw)/2:(oh-ih)/2:white" -crf 24 new_file.mp4
I have two long audio files. I want to merge cut some part from each video
and merge both parts in one file.
In below command the problem there is no audio in the second audio part. It contain the first part and the second is empty.
What is the problem?
ffmpeg -f lavfi -i color=c=black
-ss 157.824 -t 99.818
-i "file1.mp4"
-ss 315.764 -t 50.308
-i "file2.mp4"
-s 854x480
-aspect 1.779167
-r 25
-c:v libx264
-b:v 800k
-c:a aac
-strict experimental
-b:a 128k
-f mp4
-t 150.126 -async 1
-y "output.mp4"
Currently, using ffmpeg, I am using two commands on my Terminal to:
1) create a video from a bunch of images:
ffmpeg -r 60 -f image2 -s 1920x1080 -i rotated-pano_frame%05d_color_corrected_gradblend.jpg -vcodec libx264 -crf 25 -pix_fmt yuv420p test.mp4
2) stream the video to a udp address:
ffmpeg -re -i test.mp4 -c copy -f flv udp://127.0.0.1:48550
I am trying to combine both these instructions into one command line instruction, using &&, as suggested in the answer to a previous question of mine:
ffmpeg -r 60 -f image2 -s 1920x1080 -i rotated-pano_frame%05d_color_corrected_gradblend.jpg -vcodec libx264 -crf 25 -pix_fmt yuv420p test.mp4 \
&& ffmpeg -re -i test.mp4 -c copy -f flv udp://127.0.0.1:48550
but am encountering an error which prevents streaming:
[flv # 0x7fa2ba800000] video stream discovered after head already parsed.
Thoughts on a different command line syntax to join the two instructions, different ffmpeg instruction (filters perhaps?), and why I am getting the error?
./ffmpeg \
-f alsa -async 1 -ac 2 -i hw:2,0 \
-f video4linux2 -vsync 1 -s:v vga -i /dev/video0 \
-acodec aac -b:a 40k \
-r 25 -s:v vga -vcodec libx264 -strict -2 -crf 25 -preset fast -b:v 320K -pass 1 \
-f flv rtmp://192.168.2.105/live/testing
with the above command i able to stream with fps of 25 but their is no audio and video synchronization i.e., audio is faster than video,i am using ffmpeg 0.11.1 version on the pandaboard for an rtmp streaming ,help me out to solve this problem.
Thanks
Ameeth
Don't use -pass 1 if you're not actually doing two-pass encoding.
From the docs (emphasis added):
‘-pass[:stream_specifier] n (output,per-stream)’
Select the pass number (1 or 2). It is used to do two-pass video encoding. The statistics of the video are recorded in the first pass into a log file (see also the option -passlogfile), and in the second pass that log file is used to generate the video at the exact requested bitrate. On pass 1, you may just deactivate audio and set output to null, examples for Windows and Unix:
ffmpeg -i foo.mov -c:v libxvid -pass 1 -an -f rawvideo -y NUL
ffmpeg -i foo.mov -c:v libxvid -pass 1 -an -f rawvideo -y /dev/null
I was streaming to Twitch, and, funnily enough, removing the -r option made video sync with the audio. Now, you might want to have the framerate limited in some way; unfortunately, I have no solution for that, but it does allow to sync the video with the audio very well.