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 *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. Thanks _______________________________________________ ffmpeg-user mailing list [email protected] https://ffmpeg.org/mailman/listinfo/ffmpeg-user To unsubscribe, visit link above, or email [email protected] with subject "unsubscribe".
