ffmpeg adding white flash frame at end of .mov output file

[Lou Logan]

Please show the complete console output from your command. Make sure to use the CODE button to format it properly; it makes it easier to read.

[Mark Burton]

Apologies, here is the full command and result.
Note – I have edited the inputfile and outputfile paths to remove the full path.
They are both located on the Desktop of the system.

Many thanks for any help you can offer,
Mark

ffmpeg -i input.mov -y -c:v libx264 -profile:v main -preset medium -b:v 2400000 -pix_fmt yuv420p -movflags +faststart -strict -2 -c:a aac -b:a 128k output.mov
ffmpeg version 2.5.2 Copyright (c) 2000-2014 the FFmpeg developers
built on Jan 1 2015 20:24:48 with llvm-gcc 4.2.1 (LLVM build 2336.11.00)
configuration: --prefix=/Volumes/tempdisk/sw --as=yasm --enable-gpl --enable-pthreads --disable-ffplay --disable-ffserver --disable-shared --enable-static --enable-libvpx --disable-decoder=libvpx --enable-libmp3lame --enable-libopus --enable-libtheora --enable-libvorbis --enable-libx264 --enable-libx265 --enable-libxvid --enable-zlib --enable-avfilter --enable-fontconfig --enable-libfreetype --enable-libass --enable-libutvideo --enable-filters --enable-postproc --enable-runtime-cpudetect
libavutil 54. 15.100 / 54. 15.100
libavcodec 56. 13.100 / 56. 13.100
libavformat 56. 15.102 / 56. 15.102
libavdevice 56. 3.100 / 56. 3.100
libavfilter 5. 2.103 / 5. 2.103
libswscale 3. 1.101 / 3. 1.101
libswresample 1. 1.100 / 1. 1.100
libpostproc 53. 3.100 / 53. 3.100
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from ‘/input.mov':
Metadata:
major_brand : qt
minor_version : 537199360
compatible_brands: qt
creation_time : 2015-08-14 18:59:43
timecode : 01:00:00:00
Duration: 00:11:00.21, start: 0.000000, bitrate: 118696 kb/s
Stream #0:0(eng): Video: dnxhd (AVdn / 0x6E645641), yuv422p, 1920x1080, 116391 kb/s, 24 fps, 24 tbr, 24k tbn, 24k tbc (default)
Metadata:
creation_time : 2015-08-14 18:59:43
handler_name : Apple Alias Data Handler
encoder : Avid DNxHD Codec
Stream #0:1(eng): Audio: pcm_s24le (in24 / 0x34326E69), 48000 Hz, stereo, s32 (24 bit), 2304 kb/s (default)
Metadata:
creation_time : 2015-08-14 18:59:43
handler_name : Apple Alias Data Handler
Stream #0:2(eng): Data: none (tmcd / 0x64636D74) (default)
Metadata:
creation_time : 2015-08-14 19:03:29
handler_name : Apple Alias Data Handler
timecode : 01:00:00:00
[libx264 @ 0x7f8d8903b000] using cpu capabilities: MMX2 SSE2Fast SSSE3 SSE4.2
[libx264 @ 0x7f8d8903b000] profile Main, level 4.0
[libx264 @ 0x7f8d8903b000] 264 - core 142 r2479 dd79a61 - H.264/MPEG-4 AVC codec - Copyleft 2003-2014 - https://www.videolan.org/x264.html - options: cabac=1 ref=3 deblock=1:0:0 analyse=0x1:0x111 me=hex subme=7 psy=1 psy_rd=1.00:0.00 mixed_ref=1 me_range=16 chroma_me=1 trellis=1 8x8dct=0 cqm=0 deadzone=21,11 fast_pskip=1 chroma_qp_offset=-2 threads=36 lookahead_threads=6 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=24 scenecut=40 intra_refresh=0 rc_lookahead=40 rc=abr mbtree=1 bitrate=2400 ratetol=1.0 qcomp=0.60 qpmin=0 qpmax=69 qpstep=4 ip_ratio=1.40 aq=1:1.00
Output #0, mov, to '/output.mov':
Metadata:
major_brand : qt
minor_version : 537199360
compatible_brands: qt
timecode : 01:00:00:00
encoder : Lavf56.15.102
Stream #0:0(eng): Video: h264 (libx264) (avc1 / 0x31637661), yuv420p, 1920x1080, q=-1--1, 2400 kb/s, 24 fps, 12288 tbn, 24 tbc (default)
Metadata:
creation_time : 2015-08-14 18:59:43
handler_name : Apple Alias Data Handler
encoder : Lavc56.13.100 libx264
Stream #0:1(eng): Audio: aac (mp4a / 0x6134706D), 48000 Hz, stereo, fltp (24 bit), 128 kb/s (default)
Metadata:
creation_time : 2015-08-14 18:59:43
handler_name : Apple Alias Data Handler
encoder : Lavc56.13.100 aac
Stream mapping:
Stream #0:0 -> #0:0 (dnxhd (native) -> h264 (libx264))
Stream #0:1 -> #0:1 (pcm_s24le (native) -> aac (native))
Press [q] to stop, [?] for help
[mov @ 0x7f8d89081000] Starting second pass: moving the moov atom to the beginning of the file
frame=15845 fps= 82 q=-1.0 Lsize= 11956kB time=00:11:00.22 bitrate= 148.4kbits/s
video:1145kB audio:10362kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 3.906625%
[libx264 @ 0x7f8d8903b000] frame I:64 Avg QP: 0.16 size: 431
[libx264 @ 0x7f8d8903b000] frame P:3993 Avg QP: 0.02 size: 78
[libx264 @ 0x7f8d8903b000] frame B:11788 Avg QP: 0.04 size: 71
[libx264 @ 0x7f8d8903b000] consecutive B-frames: 0.8% 0.0% 0.0% 99.2%
[libx264 @ 0x7f8d8903b000] mb I I16..4: 100.0% 0.0% 0.0%
[libx264 @ 0x7f8d8903b000] mb P I16..4: 0.0% 0.0% 0.0% P16..4: 0.0% 0.0% 0.0% 0.0% 0.0% skip:100.0%
[libx264 @ 0x7f8d8903b000] mb B I16..4: 0.0% 0.0% 0.0% B16..8: 0.0% 0.0% 0.0% direct: 0.0% skip:100.0%
[libx264 @ 0x7f8d8903b000] final ratefactor: -46.80
[libx264 @ 0x7f8d8903b000] coded y,uvDC,uvAC intra: 0.0% 0.0% 0.0% inter: 0.0% 0.0% 0.0%
[libx264 @ 0x7f8d8903b000] i16 v,h,dc,p: 99% 0% 1% 0%
[libx264 @ 0x7f8d8903b000] i8c dc,h,v,p: 100% 0% 0% 0%
[libx264 @ 0x7f8d8903b000] Weighted P-Frames: Y:0.0% UV:0.0%
[libx264 @ 0x7f8d8903b000] kb/s:14.20

[Lou Logan]

Please test a build from recent git master. For OS X you can get a recent snapshot from here:
https://evermeet.cx/ffmpeg/

What player are you using? Does it occur with ffplay?
Does it occur if you do not encode the audio? (add -an option)
Does it occur with a different video encoder, such as mpeg4?
Does it occur with just one input file, or others too? Do you have a short input file you can share so the issue can be reproduced?

[Mark Burton]

As per the other threads linked, this appears to be limited to x264 and clips with both audio and video and has something to do with millisecond differences in the audio length compared to the frames of the video. Really hoping someone has found a workaround as making H264 files is a hugely popular use for this tool.

Please test a build from recent git master. For OS X you can get a recent snapshot from here:
https://evermeet.cx/ffmpeg/
No difference with latest 2.7.2 build.

What player are you using? Does it occur with ffplay?
It does not show in QT Player and other Quicktime based playback engines. It does show in VLC, Quicktime and another online viewing platform we use. I don’t use ffplay, but believe it does show the issue based on the other threads linked. Basically its there, its just that some players down’t read it.

Does it occur if you do not encode the audio? (add -an option)
Only occurs when there is audio as well.

Does it occur with a different video encoder, such as mpeg4?
Issue seems to be limited to the x264 codec.

Does it occur with just one input file, or others too? Do you have a short input file you can share so the issue can be reproduced?
Happens across all clips, sometimes it doesn’t, but I believe this is luck based on the audio samples and video length.

[Lou Logan]

[Mark Burton] “No difference with latest 2.7.2 build.”

I was referring to the git snapshot, not the release. General users are recommended to use a build from current git master. Releases are targeted for distributors and are never as up to date as git master.

[Mark Burton]

Got it. Could you point me to the latest Mac OS X build from the current git master.
Thanks

[Lou Logan]

Go here: https://evermeet.cx/ffmpeg/

Click the first green box on the left. It will look something like:
ffmpeg-74581-g1bbb5ea.7z

[Mark Burton]

Thanks for that. Have tested with the latest and its no different unfortunately.

[Reuben Martin]

If it really is a mismatch between audio and video stream length, add “-shortest” to the command arguments which stops encoding once the end of the shortest stream is reached.

[Mark Burton]

Thanks. I did try that before since it was mentioned in another thread – from my first post – the user in that post reported that it made no difference for them. I found it also made no difference for me. Although I wasn’t 100% clear on the best place to put -shortest in the ffmpeg commend, where should it go in the command?

Many thanks to everyone for the continued help and ideas.