On 14/05/2020, Ram Shaffir <r...@ram.sh> wrote: > Hi Carl, > > Got some progress ,however, whenever I use the h264_omx I still get > low-quality video output compared with libx264 (increasing the bitrate > didn't do too much), my current command is: > > ffmpeg -y -f alsa -thread_queue_size 15000 -ac 2 -itsoffset -0.5 -i hw:1,0 > -f v4l2 -thread_queue_size 15000 -i /dev/video0 -acodec ac3 -ab 51k -s > 896x504 -r 30 -vcodec h264_omx -b:v 10000K -pix_fmt yuv420p -f mp4 > /usr/ramDisk/h264_omx.mp4 -loglevel debug 2> /usr/ramDisk/h264_omx.mp4.log > your version of FFmpeg is very old
<snipped> > Opening an input file: hw:1,0. > [alsa @ 0x748310] All info found > Guessed Channel Layout for Input Stream #0.0 : stereo > Input #0, alsa, from 'hw:1,0': > Duration: N/A, start: 1589402974.746268, bitrate: 1536 kb/s > Stream #0:0, 1, 1/1000000: Audio: pcm_s16le, 48000 Hz, stereo, s16, 1536 > kb/s > Successfully opened the file. > Parsing a group of options: input url /dev/video0. > Applying option f (force format) with argument v4l2. > Applying option thread_queue_size (set the maximum number of queued packets > from the demuxer) with argument 15000. > Successfully parsed a group of options. > Opening an input file: /dev/video0. > [video4linux2,v4l2 @ 0x75bb30] fd:3 capabilities:84a00001 > [video4linux2,v4l2 @ 0x75bb30] Current input_channel: 0, input_name: HDMI, > input_std: 0 > [video4linux2,v4l2 @ 0x75bb30] Querying the device for the current frame > size > [video4linux2,v4l2 @ 0x75bb30] Setting frame size to 1920x1080 > [video4linux2,v4l2 @ 0x75bb30] The V4L2 driver changed the pixel format from > 0x32315559 to 0x56595559 > [video4linux2,v4l2 @ 0x75bb30] Trying to set codec:rawvideo pix_fmt:yuv420p > [video4linux2,v4l2 @ 0x75bb30] The V4L2 driver changed the pixel format from > 0x32315559 to 0x56595559 > [video4linux2,v4l2 @ 0x75bb30] Trying to set codec:rawvideo pix_fmt:yuv420p > [video4linux2,v4l2 @ 0x75bb30] The V4L2 driver changed the pixel format from > 0x32315659 to 0x56595559 > [video4linux2,v4l2 @ 0x75bb30] Trying to set codec:rawvideo pix_fmt:yuv422p > [video4linux2,v4l2 @ 0x75bb30] The V4L2 driver changed the pixel format from > 0x50323234 to 0x56595559 > [video4linux2,v4l2 @ 0x75bb30] Trying to set codec:rawvideo pix_fmt:yuyv422 > [video4linux2,v4l2 @ 0x75bb30] All info found > Input #1, video4linux2,v4l2, from '/dev/video0': > Duration: N/A, start: 963.335659, bitrate: 1988671 kb/s > Stream #1:0, 1, 1/1000000: Video: rawvideo, 1 reference frame (YUY2 / > 0x32595559), yuyv422, 1920x1080, 0/1, 1988671 kb/s, 59.94 fps, 59.94 tbr, > 1000k tbn, 1000k tbc > Successfully opened the file. you are not setting up the /dev/video0 input correctly see <https://trac.ffmpeg.org/wiki/Capture/Webcam> Let the camera/capture card to the encoding and save stream with -c:v copy -c:a copy > Many thanks again! > Best, > RS _______________________________________________ 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".