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Sur d’autres sites (5481)
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Top Conversion Metrics to Track in 2024
22 janvier 2024, par Erin -
ffmpeg concat skips frames near end of each subclip
3 janvier 2024, par calvinusesyourcodeSo I have some video files to concat but in the resulting video the last few frames of each subclip are buggy. Imagine in the last 5 frames the first 3 frames are skipped and so at the end of each clip it seems to jitter.


It should be virtually impossible for my input videos to have any differences between them, as they were all recorded on the same iPhone and all converted with the same command :


command = [
 'ffmpeg', '-y',
 '-i', input_path,
 '-vf', 'scale=1080:1920',
 '-r', '30',
 '-c:v', 'libx264',
 output_path
 ]
subprocess.run(command, check=True)



I have tried re-encoding instead of merely copying and adding
-r 30
but that doesn't seem to work.

subprocess.run(["ffmpeg", "-y", "-f", "concat", "-safe", "0", "-i", temp_textfile, "-c", "copy", output_path])



subprocess.run(["ffmpeg", "-y", "-f", "concat", "-safe", "0", "-i", temp_textfile, "-r", "30", "-c:v", "libx264", "-c:a", "aac", output_path], check=True)



Somewhere someone said to open in VLC and do a frame-by-frame, reporting that "the frames are actually there, just not visually when watching normally". In my case the frame-by-frame reveals the frames are indeed being skipped.


Full console output :


ffmpeg version 2023-05-18-git-01d9a84ef5-full_build-www.gyan.dev Copyright (c) 2000-2023 the FFmpeg developers
 built with gcc 12.2.0 (Rev10, Built by MSYS2 project)
 configuration: --enable-gpl --enable-version3 --enable-static --disable-w32threads --disable-autodetect --enable-fontconfig --enable-iconv --enable-gnutls --enable-libxml2 --enable-gmp --enable-bzlib --enable-lzma --enable-libsnappy --enable-zlib --enable-librist --enable-libsrt --enable-libssh --enable-libzmq --enable-avisynth --enable-libbluray --enable-libcaca --enable-sdl2 --enable-libaribb24 --enable-libaribcaption --enable-libdav1d --enable-libdavs2 --enable-libuavs3d --enable-libzvbi --enable-librav1e --enable-libsvtav1 --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxavs2 --enable-libxvid --enable-libaom --enable-libjxl --enable-libopenjpeg --enable-libvpx --enable-mediafoundation --enable-libass --enable-frei0r --enable-libfreetype --enable-libfribidi --enable-liblensfun --enable-libvidstab --enable-libvmaf --enable-libzimg --enable-amf --enable-cuda-llvm --enable-cuvid --enable-ffnvcodec --enable-nvdec --enable-nvenc --enable-d3d11va --enable-dxva2 --enable-libvpl --enable-libshaderc --enable-vulkan --enable-libplacebo --enable-opencl --enable-libcdio --enable-libgme --enable-libmodplug --enable-libopenmpt --enable-libopencore-amrwb --enable-libmp3lame --enable-libshine --enable-libtheora --enable-libtwolame --enable-libvo-amrwbenc --enable-libcodec2 --enable-libilbc --enable-libgsm --enable-libopencore-amrnb --enable-libopus --enable-libspeex --enable-libvorbis --enable-ladspa 
--enable-libbs2b --enable-libflite --enable-libmysofa --enable-librubberband --enable-libsoxr --enable-chromaprint
 libavutil 58. 7.100 / 58. 7.100
 libavcodec 60. 14.100 / 60. 14.100
 libavformat 60. 5.100 / 60. 5.100
 libavdevice 60. 2.100 / 60. 2.100
 libavfilter 9. 8.100 / 9. 8.100
 libswscale 7. 2.100 / 7. 2.100
 libswresample 4. 11.100 / 4. 11.100
 libpostproc 57. 2.100 / 57. 2.100
[mov,mp4,m4a,3gp,3g2,mj2 @ 000001d60610ebc0] Auto-inserting h264_mp4toannexb bitstream filter
Input #0, concat, from 'run\broll_subclips.txt':
 Duration: N/A, start: -0.023220, bitrate: 3094 kb/s
 Stream #0:0(und): Video: h264 (High 10) (avc1 / 0x31637661), yuv420p10le(tv, bt2020nc/bt2020/arib-std-b67, progressive), 1080x1920, 2968 kb/s, 30 fps, 30 tbr, 15360 tbn
 Metadata:
 handler_name : Core Media Video
 vendor_id : [0][0][0][0]
 encoder : Lavc60.14.100 libx264
 Stream #0:1(und): Audio: aac (LC) (mp4a / 0x6134706D), 44100 Hz, stereo, fltp, 126 kb/s
 Metadata:
 handler_name : Core Media Audio
 vendor_id : [0][0][0][0]
Stream mapping:
 Stream #0:0 -> #0:0 (h264 (native) -> h264 (libx264))
 Stream #0:1 -> #0:1 (aac (native) -> aac (native))
Press [q] to stop, [?] for help
[libx264 @ 000001d6066fd380] using cpu capabilities: MMX2 SSE2Fast SSSE3 SSE4.2 AVX 
FMA3 BMI2 AVX2
[libx264 @ 000001d6066fd380] profile High 10, level 4.0, 4:2:0, 10-bit
[libx264 @ 000001d6066fd380] 264 - core 164 r3107 a8b68eb - H.264/MPEG-4 AVC codec - Copyleft 2003-2023 - http://www.videolan.org/x264.html - options: cabac=1 ref=3 deblock=1:0:0 analyse=0x3:0x113 me=hex subme=7 psy=1 psy_rd=1.00:0.00 mixed_ref=1 me_range=16 chroma_me=1 trellis=1 8x8dct=1 cqm=0 deadzone=21,11 fast_pskip=1 chroma_qp_offset=-2 threads=12 lookahead_threads=2 sliced_threads=0 nr=0 decimate=1 interlaced=0 bluray_compat=0 constrained_intra=0 bframes=3 b_pyramid=2 b_adapt=1 b_bias=0 direct=1 weightb=1 open_gop=0 weightp=2 keyint=250 keyint_min=25 scenecut=40 intra_refresh=0 rc_lookahead=40 rc=crf mbtree=1 crf=23.0 qcomp=0.60 qpmin=0 qpmax=81 qpstep=4 ip_ratio=1.40 aq=1:1.00
Output #0, mp4, to 'joined_clips.mp4':
 Metadata:
 encoder : Lavf60.5.100
 Stream #0:0(und): Video: h264 (avc1 / 0x31637661), yuv420p10le(tv, bt2020nc/bt2020/arib-std-b67, progressive), 1080x1920, q=2-31, 30 fps, 15360 tbn
 Metadata:
 handler_name : Core Media Video
 vendor_id : [0][0][0][0]
 encoder : Lavc60.14.100 libx264
 Side data:
 cpb: bitrate max/min/avg: 0/0/0 buffer size: 0 vbv_delay: N/A
 Stream #0:1(und): Audio: aac (LC) (mp4a / 0x6134706D), 44100 Hz, stereo, fltp, 128 kb/s
 Metadata:
 handler_name : Core Media Audio
 vendor_id : [0][0][0][0]
 encoder : Lavc60.14.100 aac
frame= 0 fps=0.0 q=0.0 size= 0kB time=00:00:00.23 bitrate= 1.7kbits/s dup[mov,mp4,m4a,3gp,3g2,mj2 @ 000001d608de8100] Auto-inserting h264_mp4toannexb bitstream filter
frame= 0 fps=0.0 q=0.0 size= 0kB time=00:00:01.97 bitrate= 0.2kbits/s dupframe= 42 fps= 41 q=41.0 size= 256kB time=00:00:01.97 bitrate=1062.7kbits/s du[mov,mp4,m4a,3gp,3g2,mj2 @ 000001d608de8100] Auto-inserting h264_mp4toannexb bitstream filter
frame= 81 fps= 53 q=41.0 size= 768kB time=00:00:04.71 bitrate=1334.8kbits/s du[mov,mp4,m4a,3gp,3g2,mj2 @ 000001d608de8100] Auto-inserting h264_mp4toannexb bitstream filter
frame= 124 fps= 61 q=41.0 size= 1280kB time=00:00:06.10 bitrate=1717.1kbits/s duframe= 178 fps= 69 q=38.0 size= 1536kB time=00:00:07.96 bitrate=1579.9kbits/s du[mov,mp4,m4a,3gp,3g2,mj2 @ 000001d608de8100] Auto-inserting h264_mp4toannexb bitstream filter
frame= 235 fps= 76 q=41.0 size= 2048kB time=00:00:09.84 bitrate=1704.1kbits/s du[mov,mp4,m4a,3gp,3g2,mj2 @ 000001d608de8100] Auto-inserting h264_mp4toannexb bitstream filter
frame= 273 fps= 76 q=41.0 size= 2560kB time=00:00:11.12 bitrate=1885.5kbits/s du[mov,mp4,m4a,3gp,3g2,mj2 @ 000001d608de8100] Auto-inserting h264_mp4toannexb bitstream filter
frame= 309 fps= 75 q=41.0 size= 2816kB time=00:00:12.30 bitrate=1874.5kbits/s duframe= 354 fps= 77 q=41.0 size= 3328kB time=00:00:13.83 bitrate=1969.9kbits/s du[mov,mp4,m4a,3gp,3g2,mj2 @ 000001d608de8100] Auto-inserting h264_mp4toannexb bitstream filter
frame= 411 fps= 80 q=41.0 size= 3840kB time=00:00:15.72 bitrate=2001.1kbits/s du[mov,mp4,m4a,3gp,3g2,mj2 @ 000001d608de8100] Auto-inserting h264_mp4toannexb bitstream filter
frame= 479 fps= 85 q=41.0 size= 4096kB time=00:00:17.99 bitrate=1864.6kbits/s du[mov,mp4,m4a,3gp,3g2,mj2 @ 000001d608de8100] Auto-inserting h264_mp4toannexb bitstream filter
frame= 515 fps= 84 q=41.0 size= 4608kB time=00:00:19.20 bitrate=1965.7kbits/s duframe= 549 fps= 81 q=41.0 size= 4864kB time=00:00:20.31 bitrate=1961.1kbits/s du[mov,mp4,m4a,3gp,3g2,mj2 @ 000001d60c3e8d40] Auto-inserting h264_mp4toannexb bitstream filter
frame= 600 fps= 83 q=41.0 size= 5632kB time=00:00:22.03 bitrate=2093.7kbits/s du[mov,mp4,m4a,3gp,3g2,mj2 @ 000001d60c3e8d40] Auto-inserting h264_mp4toannexb bitstream filter
frame= 648 fps= 83 q=41.0 size= 5888kB time=00:00:23.61 bitrate=2042.5kbits/s du[out#0/mp4 @ 000001d6061163c0] video:6385kB audio:335kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 0.377336%
frame= 724 fps= 86 q=-1.0 Lsize= 6746kB time=00:00:24.03 bitrate=2299.4kbits/s dup=6 drop=2 speed=2.86x
[libx264 @ 000001d6066fd380] frame I:12 Avg QP:26.96 size: 87427
[libx264 @ 000001d6066fd380] frame P:191 Avg QP:32.28 size: 15534
[libx264 @ 000001d6066fd380] frame B:521 Avg QP:35.40 size: 4840
[libx264 @ 000001d6066fd380] consecutive B-frames: 2.9% 2.8% 2.1% 92.3%
[libx264 @ 000001d6066fd380] mb I I16..4: 21.0% 56.5% 22.5%
[libx264 @ 000001d6066fd380] mb P I16..4: 1.9% 6.3% 1.0% P16..4: 25.0% 4.5% 2.2% 0.0% 0.0% skip:59.1%
[libx264 @ 000001d6066fd380] mb B I16..4: 0.2% 0.7% 0.1% B16..8: 24.4% 1.8% 0.2% direct: 0.3% skip:72.3% L0:46.0% L1:50.7% BI: 3.3%
[libx264 @ 000001d6066fd380] 8x8 transform intra:64.9% inter:79.1%
[libx264 @ 000001d6066fd380] coded y,uvDC,uvAC intra: 42.4% 26.9% 3.0% inter: 3.7% 0.9% 0.0%
[libx264 @ 000001d6066fd380] i16 v,h,dc,p: 25% 28% 12% 35%
[libx264 @ 000001d6066fd380] i8 v,h,dc,ddl,ddr,vr,hd,vl,hu: 23% 18% 23% 5% 6% 6% 
 6% 6% 6%
[libx264 @ 000001d6066fd380] i4 v,h,dc,ddl,ddr,vr,hd,vl,hu: 27% 21% 19% 5% 6% 6% 
 7% 5% 5%
[libx264 @ 000001d6066fd380] i8c dc,h,v,p: 71% 13% 13% 4%
[libx264 @ 000001d6066fd380] Weighted P-Frames: Y:0.0% UV:0.0%
[libx264 @ 000001d6066fd380] ref P L0: 68.7% 17.8% 13.4%
[libx264 @ 000001d6066fd380] ref B L0: 88.4% 9.1% 2.5%
[libx264 @ 000001d6066fd380] ref B L1: 96.9% 3.1%
[libx264 @ 000001d6066fd380] kb/s:2167.24
[aac @ 000001d606184b40] Qavg: 346.828



UPDATE : I am thinking that the way I am converting my files from .mov to .mp4 is the problem. Please suggest the best way to convert from iPhone 4k 60fps .mov files to nice 1080p 30fps .mp4 files. I know I could just use handbrake but I am trying to be a man here xD. Perhaps handbrake has a
View ffmpeg code for conversion
.

UPDATE 2 : re-encoding the videos before concat with
-c:v libx264
fixes the problem... which seems weird because that is how they were originally encoded...

def join_broll(video_paths, desired_length, clip_length=None, output_path="quick_clips.mp4", preserve_inputs=True):
 subclips = []
 total_duration = 0

 temp_textfile = os.path.join(run_folder, "broll_subclips.txt")
 j = 0
 with open(temp_textfile, "w") as file:
 while True:
 for i, video_path in enumerate(video_paths):

 time_left = desired_length - total_duration
 video_duration = duration_of(video_path)
 subclip_path = f"subclip_{i+j}.mp4"

 if (not clip_length and video_duration < time_left) or (clip_length and clip_length < time_left):

 if clip_length:

 subclips.append(subclip_path)
 subprocess.run(["ffmpeg", "-y", "-i", video_path, "-t", str(clip_length), "-c:v", "libx264", subclip_path]) # added "-c:v libx264"
 total_duration += clip_length
 file.write(f"file '{os.path.join('..', subclip_path)}'\n")

 else:
 
 subclips.append(subclip_path)
 subprocess.run(["ffmpeg", "-y", "-i", video_path, "-c:v", "libx264", subclip_path]) # added "-c:v libx264"
 total_duration += video_duration
 file.write(f"file '{subclip_path}'\n")

 else:

 subclips.append(subclip_path)
 subprocess.run(["ffmpeg", "-y", "-i", video_path, "-t", str(time_left), "-c:v", "libx264", subclip_path]) # added "-c:v libx264"
 total_duration += time_left
 file.write(f"file '{os.path.join('..', subclip_path)}'\n")

 break

 j += 1
 if desired_length - total_duration < 0.1:
 break
 

 subprocess.run(["ffmpeg", "-y", "-f", "concat", "-safe", "0", "-i", temp_textfile, "-c", "copy", output_path])
 # subprocess.run(["ffmpeg", "-y", "-f", "concat", "-safe", "0", "-i", temp_textfile, "-r", "30", "-c:v", "libx264", "-c:a", "aac", output_path], check=True)
 return output_path



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