Ilia Katz <ilia.k...@gmail.com> writes: > I am using the following command to concatenate a PNG image to a MP4 video. > Both are of 920 × 256 resolution. > > ffmpeg -loop 1 -vsync 2 -t '20ms' -i '/path/to/image' -t '20ms' -f lavfi -i > aevalsrc=0 -i '/path/to/video' -filter_complex '[0:0] [1:0] [2:0] [2:1] > concat=n=2:v=1:a=1' -r 'ntsc-film' '/path/to/output_video' > > Everything works well but I am unable to shorten the image display duration > below ~20ms. > > *ffprobe of input image* > Input #0, png_pipe, from 'image.png': > Duration: N/A, bitrate: N/A > Stream #0:0: Video: png, rgba(pc), 920x256 [SAR 2835:2835 DAR 115:32], 25 > fps, 25 tbr, 25 tbn, 25 tbc
I would guess that your problem is caused by the low implied framerate, as 1/25 = 0.040. > > > *ffprobe of input video* > Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'input_video.mp4': > Metadata: > major_brand : isom > minor_version : 512 > compatible_brands: isomiso2avc1mp41 > creation_time : 2021-09-10T06:22:46.000000Z > encoder : Lavf58.45.100 > Duration: 00:00:04.16, start: 0.000000, bitrate: 452 kb/s > Stream #0:0(und): Video: h264 (High) (avc1 / 0x31637661), yuv420p(tv, > bt709/bt709/unknown), 920x256 [SAR 1:1 DAR 115:32], 119 kb/s, 25 fps, 25 > tbr, 12800 tbn, 25600 tbc (default) > Metadata: > creation_time : 2021-09-10T06:22:46.000000Z > handler_name : VideoHandler > vendor_id : [0][0][0][0] > timecode : 01:00:00:00 > Stream #0:1(und): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, > fltp, 319 kb/s (default) > Metadata: > creation_time : 2021-09-10T06:22:46.000000Z > handler_name : SoundHandler > vendor_id : [0][0][0][0] > Stream #0:2(eng): Data: none (tmcd / 0x64636D74), 0 kb/s > Metadata: > creation_time : 2021-09-10T06:22:46.000000Z > handler_name : TimeCodeHandler > timecode : 01:00:00:00 > Unsupported codec with id 0 for input stream 2 > > When running the same command but with 10ms time, i.e. > ffmpeg -loop 1 -vsync 2 -t '10ms' -i '/path/to/image' -t '10ms' -f lavfi -i > aevalsrc=0 -i '/path/to/video' -filter_complex '[0:0] [1:0] [2:0] [2:1] > concat=n=2:v=1:a=1' -r 'ntsc-film' '/path/to/output_video' > > ffmpeg is stuck in what seems to be an infinite loop of: > > [mp4 @ 0x7fc0f483d600] Delay between the first packet and last packet in > the muxing queue is 10010000 > 10000000: forcing output > [libx264 @ 0x7fc0f483e800] frame=2027 QP=13.00 NAL=0 Slice:B Poc:50 I:0 P:0 > SKIP:928 size=18 bytes > [mp4 @ 0x7fc0f483d600] Delay between the first packet and last packet in > the muxing queue is 10010000 > 10000000: forcing output > [libx264 @ 0x7fc0f483e800] frame=2028 QP=13.00 NAL=0 Slice:B Poc:54 I:0 P:0 > SKIP:928 size=18 bytes > [mp4 @ 0x7fc0f483d600] Delay between the first packet and last packet in > the muxing queue is 10010000 > 10000000: forcing output > [libx264 @ 0x7fc0f483e800] frame=2029 QP=11.00 NAL=2 Slice:P Poc:64 I:0 P:0 > SKIP:928 size=26 bytes > [mp4 @ 0x7fc0f483d600] Delay between the first packet and last packet in > the muxing queue is 10010000 > 10000000: forcing output > [libx264 @ 0x7fc0f483e800] frame=2030 QP=12.00 NAL=2 Slice:B Poc:60 I:0 P:0 > SKIP:928 size=21 bytes > [mp4 @ 0x7fc0f483d600] Delay between the first packet and last packet in > the muxing queue is 10010000 > 10000000: forcing output > [libx264 @ 0x7fc0f483e800] frame=2031 QP=13.00 NAL=0 Slice:B Poc:58 I:0 P:0 > SKIP:928 size=18 bytes > [mp4 @ 0x7fc0f483d600] Delay between the first packet and last packet in > the muxing queue is 10010000 > 10000000: forcing output > [libx264 @ 0x7fc0f483e800] frame=2032 QP=13.00 NAL=0 Slice:B Poc:62 I:0 P:0 > SKIP:928 size=18 bytes > [mp4 @ 0x7fc0f483d600] Delay between the first packet and last packet in > the muxing queue is 10010000 > 10000000: forcing output > [libx264 @ 0x7fc0f483e800] frame=2033 QP=13.00 NAL=2 Slice:P Poc:68 I:0 P:0 > SKIP:928 size=27 bytes > [mp4 @ 0x7fc0f483d600] Delay between the first packet and last packet in > the muxing queue is 10010000 > 10000000: forcing output > [libx264 @ 0x7fc0f483e800] frame=2034 QP=13.00 NAL=0 Slice:B Poc:66 I:0 P:0 > SKIP:928 size=18 bytes > [mp4 @ 0x7fc0f483d600] Delay between the first packet and last packet in > the muxing queue is 10010000 > 10000000: forcing output > > Any help will be appreciated. The warning is being issued at increasing frames, so I don't think there is an infinite loop. Maybe you just want to decrease the verbosity of the logging? You don't say if you eventually get an output. Leo _______________________________________________ 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".
