March 2017 - ffmpeg-user - lists.ffmpeg.org

MLV-files
by Cecil Westerhof 01 Apr '17

01 Apr '17

Yesterday I discovered Magic Lantern. I read that ffmpeg supports the MLV format. Does anyone has experience with this? -- Cecil Westerhof Senior Software Engineer LinkedIn: http://www.linkedin.com/in/cecilwesterhof

4 7

movement on ffmpeg .R3D v4 support?
by Rob Wentz 31 Mar '17

31 Mar '17

Hi, I work in video post production, our DPs all shoot on Red cameras. . . it's become the norm that if stuff is coming in shot on anything larger than 2K it's shot on a Red camera and the footage is in .R3D. I was hoping to be able to get somewhere with using ffmpeg to create proxies of .R3Ds before archiving them to LTO using Archiware P5 Archive. The feature works wonders for allowing us to generate scrubbable proxies of archived .mov, mp4, etc video fileswho's full res files live on LTO5 - but we currently can not use ffmpeg on the current (v4) R3D format (Red Camera). We shoot on Red Weapon and raster sizes are getting HUGE with the advent of uHD and 720/VR. It is not practical to cast a wide blind net of footage to unarchive as this material takes up so much space and takes considerable time to unarchive. Most recent tracks of any movement on this topic I found have been silent for a while: https://trac.ffmpeg.org/ticket/2690 I'm curious where things are at in terms of .R3D v4 support for ffmpeg. Thank you! Rob Wentz • Post-Production Supervisor • Pedersen Media Group 501 Second Street, Suite 212, San Francisco, CA 94107

5 11

cross compile FFPLAY
by Lars Heinrichs 31 Mar '17

31 Mar '17

Hello! I can successfully build ffmpeg using a cross compile toolchain (linaro). What I need on my target system is mostly ffplay, however, FFPLAY is missing. Some google searches showed that SDL is required to build FFPLAY, so i installed libsdl2-dev. I am running ./configure using ./configure --enable-cross-compile --cross-prefix=<toolchain_path>/arm-linux-gnueabihf- --arch=arm --cpu=armv7-a --target-os=linux what generates a warning: WARNING: <toolchain_path>/arm-linux-gnueabihf-pkg-config not found, library detection may fail. what is correct, there is no -pkg-config in the toolchain. config.mak had a line !CONFIG_FFPLAY=yes that i removed the ! from. On 'make', everything is build just fine except for ffplay: CC ffplay.o ffplay.c:56:17: fatal error: SDL.h: No such file or directory compilation terminated. I don know if the error is related to the warning I got on running the configure script. Do I need SDL to be built for the target platform (= cross compile and then link the result (how would i link this?)?) or should it be working right away? If -pgk-config does not exist, is that a problem? If what I want is not possible for some reason, what might be an alternative to ffplay?

2 1

warning cseq 10 expected 8 received
by Ankit Gupta 30 Mar '17

30 Mar '17

Hi All, using following command for RTSP to http streaming\ ffmpeg -rtsp_transport tcp -i {RTSP} -c:v libx264 -crf 35 -preset ultrafast -maxrate 3M -bufsize 300k -r 10 -g 20 -movflags +faststart -tune zerolatency -hls_time 1 -hls_list_size 4 -hls_wrap 4 -start_number 1 -hls_allow_cache 0 -threads 1 -loglevel warning -y {} but getting frequent warning "cseq 10 expected 8 received" Any help??????

1 0

H.265/HEVC for Premiere Pro compatibility
by Chris Colton 30 Mar '17

30 Mar '17

Hi all, I tried to get an answer on this before I actually subscribed to the mailing list, so I'm told I didn't receive all the replies so I'm just starting over here. I'm using FFmpeg to transcode to H.265 because Premiere's native encoding is incompatible with Vimeo (Vimeo's transcoding causes a color shift in HEVC from Premiere). I also love the constant rate factor encoding option because it'll decide bitrate depending on the resolution needed. I used the command below and VLC and Vimeo both play it (vimeo with no color issues), but if you try to check the encode to the original in Premiere, it imports with sound playing correctly and just a blank green image instead of the video. Any ideas? -i "source.mov" -y -c:v libx265 -preset veryfast -crf 23 -vf format=yuv420p -c:a aac -b:a 320k -ar 48000 -ac 2 -max_muxing_queue_size 1000 "H265.mp4" ᐧ

6 14

Starting to copy takes long
by Cecil Westerhof 29 Mar '17

29 Mar '17

I want to copy a little bit of a video. I do this with: ffmpeg -i input.mov -ss 16:28 -t 5 output.mov But it takes about 2:20 before the copying starts. Is this normal? -- Cecil Westerhof Senior Software Engineer LinkedIn: http://www.linkedin.com/in/cecilwesterhof

4 6

gain the highest quality with H264 at a certain bit rate
by negin tebyani 29 Mar '17

29 Mar '17

I have encoded my videos using ffmpeg and H264, and this is my ffmpeg command (2 pass encoding): ffmpeg -y -i Edited\ Clips/arsenalVScristalPalas.mp4 -movflags faststart -c:v libx264 -x264opts 'keyint=300:min-keyint=25:8x8dct:sliced-threads=0:subq=6' -deblock 0:0 -flags +loop -preset slow -tune zerolatency -b:v 2048k -maxrate 2048k -bufsize 3000k -vf "scale=-1280:720" -pass 1 -acodec libmp3lame -b:a 128k -coder 1 -me_range 16 -sc_threshold 42 -bf 10 -qmin 0 -qmax 51 -trellis 2 -rc_lookahead 60 -ss 00:01:00 -t 00:01:00 -f mp4 /dev/null ffmpeg -i Edited\ Clips/arsenalVScristalPalas.mp4 -movflags faststart -c:v libx264 -x264opts 'keyint=300:min-keyint=25:8x8dct:sliced-threads=0:subq=6' -deblock 0:0 -flags +loop -preset slow -tune zerolatency -b:v 2048k -maxrate 2048k -bufsize 3000k -vf "scale=-1280:720" -pass 2 -acodec libmp3lame -b:a 128k -coder 1 -me_range 16 -sc_threshold 42 -bf 10 -qmin 0 -qmax 51 -trellis 2 -rc_lookahead 60 -ss 00:01:00 -t 00:01:00 2pass15.mp4 I need the video to be in the highest quality (at the 2000kbps bitrate). I have another video with the same bitrate (from another source), but It has a better quality than my video. I need to reach that quality. I used mediainfo to get the encoding options for that video, and here is the information: General Complete name : arsenalVScristalPalas_hd.mp4 Format : MPEG-4 Format profile : Base Media Codec ID : isom (isom/iso2/avc1/mp41) File size : 171 MiB Duration : 11mn 1s Overall bit rate : 2 164 Kbps Encoded date : UTC 1904-01-01 00:00:00 Tagged date : UTC 1904-01-01 00:00:00 Writing application : Lavf57.63.100 Video ID : 1 Format : AVC Format/Info : Advanced Video Codec Format profile : Main(a)L3.1 Format settings, CABAC : Yes Format settings, ReFrames : 6 frames Codec ID : avc1 Codec ID/Info : Advanced Video Coding Duration : 11mn 1s Bit rate : 2 048 Kbps Width : 1 280 pixels Height : 720 pixels Display aspect ratio : 16:9 Frame rate mode : Constant Frame rate : 50.000 fps Color space : YUV Chroma subsampling : 4:2:0 Bit depth : 8 bits Scan type : Progressive Bits/(Pixel*Frame) : 0.044 Stream size : 160 MiB (94%) Writing library : x264 core 148 r2643 5c65704 Encoding settings : cabac=1 / ref=6 / deblock=1:1:1 / analyse=0x1:0x131 / me=umh / subme=9 / psy=1 / psy_rd=0.40:0.00 / mixed_ref=1 / me_range=16 / chroma_me=1 / trellis=2 / 8x8dct=0 / cqm=0 / deadzone=21,11 / fast_pskip=1 / chroma_qp_offset=-2 / threads=22 / lookahead_threads=5 / sliced_threads=0 / nr=0 / decimate=1 / interlaced=0 / bluray_compat=0 / constrained_intra=0 / bframes=10 / b_pyramid=2 / b_adapt=2 / b_bias=0 / direct=3 / weightb=1 / open_gop=0 / weightp=2 / keyint=300 / keyint_min=25 / scenecut=40 / intra_refresh=0 / rc_lookahead=60 / rc=2pass / mbtree=1 / bitrate=2048 / ratetol=1.0 / qcomp=0.60 / qpmin=0 / qpmax=69 / qpstep=4 / cplxblur=20.0 / qblur=0.5 / vbv_maxrate=2048 / vbv_bufsize=5000 / nal_hrd=none / filler=0 / ip_ratio=1.41 / aq=1:0.60 Language : English Encoded date : UTC 1904-01-01 00:00:00 Tagged date : UTC 1904-01-01 00:00:00 Audio ID : 2 Format : AAC Format/Info : Advanced Audio Codec Format profile : HE-AAC / LC Codec ID : 40 Duration : 11mn 1s Duration_LastFrame : -23ms Bit rate mode : Constant Bit rate : 128 Kbps Channel(s) : 2 channels Channel positions : Front: L R Sampling rate : 48.0 KHz / 24.0 KHz Frame rate : 23.438 fps (1024 spf) Compression mode : Lossy Stream size : 10.1 MiB (6%) Language : English Default : Yes Alternate group : 1 Encoded date : UTC 1904-01-01 00:00:00 Tagged date : UTC 1904-01-01 00:00:00 and this is the information of my video: General Complete name : 2pass14.mp4 Format : MPEG-4 Format profile : Base Media Codec ID : isom (isom/iso2/avc1/mp41) File size : 15.4 MiB Duration : 1mn 0s Overall bit rate : 2 150 Kbps Encoded date : UTC 1904-01-01 00:00:00 Tagged date : UTC 1904-01-01 00:00:00 Writing application : Lavf56.40.101 Video ID : 1 Format : AVC Format/Info : Advanced Video Codec Format profile : High(a)L3.2 Format settings, CABAC : Yes Format settings, ReFrames : 5 frames Codec ID : avc1 Codec ID/Info : Advanced Video Coding Duration : 1mn 0s Bit rate : 2 048 Kbps Width : 1 280 pixels Height : 720 pixels Display aspect ratio : 16:9 Frame rate mode : Constant Frame rate : 50.000 fps Color space : YUV Chroma subsampling : 4:2:0 Bit depth : 8 bits Scan type : Progressive Bits/(Pixel*Frame) : 0.044 Stream size : 14.4 MiB (94%) Writing library : x264 core 148 r2643 5c65704 Encoding settings : cabac=1 / ref=5 / deblock=1:3:3 / analyse=0x3:0x113 / me=umh / subme=6 / psy=1 / psy_rd=1.00:0.00 / mixed_ref=1 / me_range=16 / chroma_me=1 / trellis=2 / 8x8dct=1 / cqm=0 / deadzone=21,11 / fast_pskip=1 / chroma_qp_offset=-2 / threads=6 / lookahead_threads=3 / sliced_threads=0 / nr=0 / decimate=1 / interlaced=0 / bluray_compat=0 / constrained_intra=0 / bframes=10 / b_pyramid=2 / b_adapt=2 / b_bias=0 / direct=3 / weightb=1 / open_gop=0 / weightp=2 / keyint=300 / keyint_min=25 / scenecut=42 / intra_refresh=0 / rc_lookahead=0 / rc=2pass / mbtree=0 / bitrate=2048 / ratetol=1.0 / qcomp=0.60 / qpmin=10 / qpmax=51 / qpstep=4 / cplxblur=20.0 / qblur=0.5 / vbv_maxrate=2048 / vbv_bufsize=3000 / nal_hrd=none / filler=0 / ip_ratio=1.40 / pb_ratio=1.30 / aq=1:1.00 Language : English Encoded date : UTC 1904-01-01 00:00:00 Tagged date : UTC 1904-01-01 00:00:00 Audio ID : 2 Format : MPEG Audio Format version : Version 1 Format profile : Layer 3 Mode : Joint stereo Mode extension : MS Stereo Codec ID : 6B Duration : 1mn 0s Duration_LastFrame : -1ms Bit rate mode : Constant Bit rate : 128 Kbps Maximum bit rate : 2 048 Kbps Channel(s) : 2 channels Sampling rate : 48.0 KHz Compression mode : Lossy Stream size : 938 KiB (6%) Language : English Default : Yes Alternate group : 1 Encoded date : UTC 1904-01-01 00:00:00 Tagged date : UTC 1904-01-01 00:00:00 is there anything that I am doing wrong?? any suggestions on how to improve my output quality?? and here is a demo of videos, the video that has a better quality: https://ufile.io/b7a1b my video, that I need to improve quality: https://ufile.io/363f11

4 24

Using h264 video format commercially
by sunil_gupta01 29 Mar '17

29 Mar '17

Hi there, We have developed a commercial offering to create personalized videos; we're using FFmpeg to generate the videos in H.264 format. What are the legal/license obligations in terms of using FFmpeg to generate videos commercially? Do we need to purchase a license from one of codec providers? Regards, Sunil G.

3 2

ffplay on current build does not play mkv file but on old build does.
by Tim Hiles 29 Mar '17

29 Mar '17

Hi, I have two zeranoe windows builds installed. Current version built and an older build from 2015. I've created a 5 second video (full command line and uncut output below) using current git. I only hear audio when I play this file back when I use current build. However the 2015 build plays fine. I've also included ffplay.exe command line and uncut output below from both older and current builds below. Also, possibly separate issue but as you can see I do get an error when creating the video that doesn't effect playing the file with the old version or VLC. But, I'm curious as to why I get the error, how this effects the file, and perhaps how to fix it if it should be fixed. Lastly, I've included the report log if that provides any further detail to aid. C:\Users\c0nF3x41l3s>c:\ffmpeg\ffmpeg\bin\ffmpeg.exe -f dshow -i video="screen-capture-recorder":audio="Internal Mic (ID T High Definiti" -flags +global_header -vcodec libx264 -pix_fmt yuv420p -preset ultrafast -acodec aac -ac 1 -ar 22050 -t 00:00:05 -report "C:\CMT\Test.mkv" ffmpeg started on 2016-11-09 at 10:02:54 Report written to "ffmpeg-20161109-100254.log" ffmpeg version N-82274-g34aeb5d Copyright (c) 2000-2016 the FFmpeg developers built with gcc 5.4.0 (GCC) configuration: --enable-gpl --enable-version3 --disable-w32threads --enable-dxva2 --enable-libmfx --enable-nvenc --ena ble-avisynth --enable-bzlib --enable-libebur128 --enable-fontconfig --enable-frei0r --enable-gnutls --enable-iconv --ena ble-libass --enable-libbluray --enable-libbs2b --enable-libcaca --enable-libfreetype --enable-libgme --enable-libgsm --e nable-libilbc --enable-libmodplug --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-lib openh264 --enable-libopenjpeg --enable-libopus --enable-librtmp --enable-libschroedinger --enable-libsnappy --enable-lib soxr --enable-libspeex --enable-libtheora --enable-libtwolame --enable-libvidstab --enable-libvo-amrwbenc --enable-libvo rbis --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxavs --enable-li bxvid --enable-libzimg --enable-lzma --enable-decklink --enable-zlib libavutil 55. 35.100 / 55. 35.100 libavcodec 57. 66.101 / 57. 66.101 libavformat 57. 57.100 / 57. 57.100 libavdevice 57. 2.100 / 57. 2.100 libavfilter 6. 66.100 / 6. 66.100 libswscale 4. 3.100 / 4. 3.100 libswresample 2. 4.100 / 2. 4.100 libpostproc 54. 2.100 / 54. 2.100 leaving aero onGuessed Channel Layout for Input Stream #0.1 : stereo Input #0, dshow, from 'video=screen-capture-recorder:audio=Internal Mic (IDT High Definiti': Duration: N/A, start: 349092.854000, bitrate: N/A Stream #0:0: Video: rawvideo, bgr0, 1366x768, 30 fps, 30 tbr, 10000k tbn, 10000k tbc Stream #0:1: Audio: pcm_s16le, 44100 Hz, stereo, s16, 1411 kb/s [libx264 @ 0000000000397120] using cpu capabilities: MMX2 SSE2Fast SSSE3 SSE4.2 AVX [libx264 @ 0000000000397120] profile Constrained Baseline, level 3.2 [libx264 @ 0000000000397120] 264 - core 148 r2721 72d53ab - H.264/MPEG-4 AVC codec - Copyleft 2003-2016 - http://www.vid eolan.org/x264.html - options: cabac=0 ref=1 deblock=0:0:0 analyse=0:0 me=dia subme=0 psy=1 psy_rd=1.00:0.00 mixed_ref=0 me_range=16 chroma_me=1 trellis=0 8x8dct=0 cqm=0 deadzone=21,11 fast_pskip=1 chroma_qp_offset=0 threads=12 lookahead_th reads=2 sliced_threads=0 nr=0 decimate=1 interlaced=0 bluray_compat=0 constrained_intra=0 bframes=0 weightp=0 keyint=250 keyint_min=25 scenecut=0 intra_refresh=0 rc=crf mbtree=0 crf=23.0 qcomp=0.60 qpmin=0 qpmax=69 qpstep=4 ip_ratio=1.40 aq =0 Output #0, matroska, to 'C:\CMT\Test.mkv': Metadata: encoder : Lavf57.57.100 Stream #0:0: Video: h264 (libx264) (H264 / 0x34363248), yuv420p, 1366x768, q=-1--1, 30 fps, 1k tbn, 30 tbc Metadata: encoder : Lavc57.66.101 libx264 Side data: cpb: bitrate max/min/avg: 0/0/0 buffer size: 0 vbv_delay: -1 Stream #0:1: Audio: aac (LC) ([255][0][0][0] / 0x00FF), 22050 Hz, mono, fltp, 69 kb/s Metadata: encoder : Lavc57.66.101 aac Stream mapping: Stream #0:0 -> #0:0 (rawvideo (native) -> h264 (libx264)) Stream #0:1 -> #0:1 (pcm_s16le (native) -> aac (native)) Press [q] to stop, [?] for help [swscaler @ 00000000003a7fe0] Warning: data is not aligned! This can lead to a speedloss frame= 150 fps= 28 q=-1.0 Lsize= 758kB time=00:00:05.00 bitrate=1239.5kbits/s speed=0.919x video:715kB audio:40kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 0.349632% [libx264 @ 0000000000397120] frame I:1 Avg QP:20.00 size:218939 [libx264 @ 0000000000397120] frame P:149 Avg QP:13.87 size: 3441 [libx264 @ 0000000000397120] mb I I16..4: 100.0% 0.0% 0.0% [libx264 @ 0000000000397120] mb P I16..4: 0.6% 0.0% 0.0% P16..4: 2.9% 0.0% 0.0% 0.0% 0.0% skip:96.6% [libx264 @ 0000000000397120] coded y,uvDC,uvAC intra: 44.2% 4.5% 4.0% inter: 1.6% 0.3% 0.2% [libx264 @ 0000000000397120] i16 v,h,dc,p: 72% 25% 2% 2% [libx264 @ 0000000000397120] i8c dc,h,v,p: 88% 9% 3% 0% [libx264 @ 0000000000397120] kb/s:1170.64 [aac @ 000000000039a020] Qavg: 3008.527 [dshow @ 00000000006a8880] real-time buffer [screen-capture-recorder] [video input] too full or near too full (275% of s ize: 3041280 [rtbufsize parameter])! frame dropped! C:\Users\c0nF3x41l3s>"C:\ffmpegOldTwo\ffmpeg\bin\ffplay.exe" -i C:\CMT\Test.mkv ffplay version N-76123-g002b049 Copyright (c) 2003-2015 the FFmpeg developers built with gcc 5.2.0 (GCC) configuration: --enable-gpl --enable-version3 --disable-w32threads --enable-avisynth --enable-bzlib --enable-fontconfi g --enable-frei0r --enable-gnutls --enable-iconv --enable-libass --enable-libbluray --enable-libbs2b --enable-libcaca -- enable-libdcadec --enable-libfreetype --enable-libgme --enable-libgsm --enable-libilbc --enable-libmodplug --enable-libm p3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg --enable-libopus --enable-librtmp --en able-libschroedinger --enable-libsoxr --enable-libspeex --enable-libtheora --enable-libtwolame --enable-libvidstab --ena ble-libvo-aacenc --enable-libvo-amrwbenc --enable-libvorbis --enable-libvpx --enable-libwavpack --enable-libwebp --enabl e-libx264 --enable-libx265 --enable-libxavs --enable-libxvid --enable-lzma --enable-decklink --enable-zlib libavutil 55. 4.100 / 55. 4.100 libavcodec 57. 7.100 / 57. 7.100 libavformat 57. 8.102 / 57. 8.102 libavdevice 57. 0.100 / 57. 0.100 libavfilter 6. 11.100 / 6. 11.100 libswscale 4. 0.100 / 4. 0.100 libswresample 2. 0.100 / 2. 0.100 libpostproc 54. 0.100 / 54. 0.100 Input #0, matroska,webm, from 'C:\CMT\Test.mkv':B sq= 0B f=0/0 Metadata: ENCODER : Lavf57.57.100 Duration: 00:00:05.05, start: 0.000000, bitrate: 1229 kb/s Stream #0:0: Video: h264 (Constrained Baseline), yuv420p, 1366x768, SAR 1:1 DAR 683:384, 30 fps, 30 tbr, 1k tbn, 60 tbc (default) Metadata: ENCODER : Lavc57.66.101 libx264 DURATION : 00:00:05.050000000 Stream #0:1: Audio: aac (LC), 22050 Hz, mono, fltp (default) Metadata: ENCODER : Lavc57.66.101 aac DURATION : 00:00:05.043000000 5.03 A-V: -7.318 fd= 0 aq= 0KB vq= 0KB sq= 0B f=0/0 C:\Users\c0nF3x41l3s>"C:\ffmpeg\ffmpeg\bin\ffplay.exe" -i C:\CMT\Test.mkv ffplay version N-82274-g34aeb5d Copyright (c) 2003-2016 the FFmpeg developers built with gcc 5.4.0 (GCC) configuration: --enable-gpl --enable-version3 --disable-w32threads --enable-dxva2 --enable-libmfx --enable-nvenc --ena ble-avisynth --enable-bzlib --enable-libebur128 --enable-fontconfig --enable-frei0r --enable-gnutls --enable-iconv --ena ble-libass --enable-libbluray --enable-libbs2b --enable-libcaca --enable-libfreetype --enable-libgme --enable-libgsm --e nable-libilbc --enable-libmodplug --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-lib openh264 --enable-libopenjpeg --enable-libopus --enable-librtmp --enable-libschroedinger --enable-libsnappy --enable-lib soxr --enable-libspeex --enable-libtheora --enable-libtwolame --enable-libvidstab --enable-libvo-amrwbenc --enable-libvo rbis --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxavs --enable-li bxvid --enable-libzimg --enable-lzma --enable-decklink --enable-zlib libavutil 55. 35.100 / 55. 35.100 libavcodec 57. 66.101 / 57. 66.101 libavformat 57. 57.100 / 57. 57.100 libavdevice 57. 2.100 / 57. 2.100 libavfilter 6. 66.100 / 6. 66.100 libswscale 4. 3.100 / 4. 3.100 libswresample 2. 4.100 / 2. 4.100 libpostproc 54. 2.100 / 54. 2.100 Input #0, matroska,webm, from 'C:\CMT\Test.mkv':B sq= 0B f=0/0 Metadata: ENCODER : Lavf57.57.100 Duration: 00:00:05.05, start: 0.000000, bitrate: 1229 kb/s Stream #0:0: Video: h264 (Constrained Baseline), yuv420p(progressive), 1366x768, 30 fps, 30 tbr, 1k tbn, 60 tbc (def ault) Metadata: ENCODER : Lavc57.66.101 libx264 DURATION : 00:00:05.050000000 Stream #0:1: Audio: aac (LC), 22050 Hz, mono, fltp (default) Metadata: ENCODER : Lavc57.66.101 aac DURATION : 00:00:05.043000000 -0.03 A-V: nan fd= 0 aq= 11KB vq= 102KB sq= 0B f=0/0 Thanks!! Tim

4 10

does ffmpeg support video/image watermark
by qw 29 Mar '17

29 Mar '17

Hi, Does ffmpeg support video/image watermark? or is there some three-party library of video/image watermark that ffmpeg supports? Thanks! Regards Andrew

3 2