Re: [FFmpeg-user] How to scale watermark proportionally to width and height of video frame?
>> How to scale watermark proportionally video frame size (to width and >> to height of video frame)? >> >> Now I use the following command: >> >> ffmpeg -i input.mkv -i logo.png -filter_complex >> "[1:v]scale=w=iw/3:h=ih/3[watermark_scaled];[0:v][watermark_scaled]overlay=x=main_w-overlay_w-main_w/20:y=main_h-overlay_h-main_w/20" >> output.mkv >> >> I use scale=w=iw/3:h=ih/3, but I can't use "main_w" and "main_h" >> variables in this place. E.g. scale=w=main_w*0.05:main_h*0.05 don't >> work. How to get video frame width and height to use them for scaling >> watermark? > > Hello, > > as far as i know, it is not possible. You have to get the video > dimension on an outer layer, like a shell script, and pass it to the > scale filter. All filters only know about their inputs, not about other > filter chains. > > Something like: > > streaminfo=`mktemp` > ffprobe -v quiet -show_streams -select_streams v:0 input.mkv >$streaminfo > width=`grep width $streaminfo | cut -d'=' -f2` > height=`grep height $streaminfo | cut -d'=' -f2` > > ffmpeg -i input.mkv -i logo.png -filter_complex > "[1:v]scale=w=$width/3:h=$height/3[watermark_scaled];[0:v][watermark_scaled]overlay=x=main_w-overlay_w-main_w/20:y=main_h-overlay_h-main_w/20" > output.mkv > > rm $streaminfo I'm using Windows. Can anyone help me solve this issue for Windows? Hope for your help! Thanks in advance! ___ ffmpeg-user mailing list ffmpeg-user@ffmpeg.org http://ffmpeg.org/mailman/listinfo/ffmpeg-user
Re: [FFmpeg-user] X264 and Smooth Text
On Mon, Jan 19, 2015 at 07:49:13 +0100, Robert Nagy wrote: > I'm using settings along the following lines right now: > ffmpeg -i in.mov -codec:v libx264 -crf 18 -maxrate 3M -bufsize 12M -preset > faster -profile:v main -level 3.2 out.mov What resolution are you operating at? In other words, please provide the complete, uncut console output from the command. It might give some more hints. Moritz ___ ffmpeg-user mailing list ffmpeg-user@ffmpeg.org http://ffmpeg.org/mailman/listinfo/ffmpeg-user
Re: [FFmpeg-user] Image Conversion TIFF > JPEG with yuv422 chroma subsampling
To add to Werner's comments: On Mon, Jan 19, 2015 at 18:05:34 +0100, Andrea Rastelli wrote: > >> Also, the only codec that works is the MJPEG, any other codec produces > >> unreadable images or extremely slow-to-process images (libopenjpeg).. I can't comment on slow-to-process images, but there's a section on the readability. It's not obvious, so thanks for asking. ;-) https://www.ffmpeg.org/ffmpeg-bitstream-filters.html#mjpeg2jpeg So please check whether adding "-bsf:v mjpeg2jpeg" (after the input file, before the output file - just saying this to be sure) solves that issue. Moritz ___ ffmpeg-user mailing list ffmpeg-user@ffmpeg.org http://ffmpeg.org/mailman/listinfo/ffmpeg-user
Re: [FFmpeg-user] How can I determine if a 10bit videofile has full 10bit video data or 8bit (+ 2bits zeros) data
Hi Christoph, > On Jan 19, 2015, at 4:02 AM, Christoph Gerstbauer > wrote: > > Thank you, Dave! > > As I guess, this commandline is just working on linux, right? On Mac. > I tried it on windows but: > > ffmpeg -i > I:\_10bit_PERFORMANCE_TESTS\analog_tape_records\10bit_v210_captured_via_SDI-8bit.mov > -c:v rawvideo -f rawvideo - | xxd -c 2 -b > 'xxd' is not recognized as an internal or external command, > operable program or batch file. I'm not familiar enough with windows to suggest an alternate to xxd, though perhaps it can be installed on windows. > The whole thing I am trying to do is: ffv1 speed/cpu load tests with 10bit > sources. > But first I have to be 100 percent shure that the v210 files I am generating > with SDI capturing are real 10bit sources. > I have several "10bit"-believing files (v210/AVC-Intra for example) but I was > not the creator of them. If in their generation chain was just one point > where 8bit was used, the 10bit information is lost. And thats why I can just > believe that it is 10bit. You could also try using ffmpeg to view a bit plane of the video, for instance: bit=8 ; ffplay -f lavfi -i mandelbrot -vf "lutyuv=y=bitand(val\,pow(2\,8-$bit))*pow(2\,$bit):u=128:v=128" Here you can set bit to an integer between 1 and 8 to present a bit plane. I haven't been able to identify a way to do this entirely within ffmpeg with a bit position above 8, since the lutyuv and geq filters only take in 8 bit. > I am capturing from a IMX VTR which allows to set the SDI bitdepth for the > SDI output (8bit/10bit). SO I can directly control that the final captured > v210 file will have 8bit or 10bit information (capturing via a AJA Kona card). > > So, for your mentioned method, I will need linux. Right? > > Addionally: > As far as I know, 10bit ffv1 compression rates are better than 8bit. SO a > "8bit"-v210 file is a little bit larger than a "10bit"-v210 file. Do you know > why? This seems unusual. The higher the bit depth of sampling from an analog source the more noise in the least significant bits so the less effective is the lossless encoding. However v210 has padding bits so that every 3 10 bit samples includes 2 bits of padding. In a v210 -> ffv1 the padding bits are discarded and could then be considered to throw off a compression rate analysis. For instance a 320x240 frame in v210 would be 215,040 bytes but only 192,000 of those bytes are non-padding data. Thus the v210 padding may through off your compression test by about 12%. (please correct me if my math is wrong here). Dave > Best Regards > Christoph > > Am 16.01.2015 um 16:40 schrieb Dave Rice: >> Hi Christoph, >> >>> On Jan 16, 2015, at 10:03 AM, Moritz Barsnick wrote: >>> On Fri, Jan 16, 2015 at 14:10:38 +0100, Christoph Gerstbauer wrote: I am searching for a possibility to check if a 10bit 4:2:2 videofile (v210 codec or ffvhuff codec) has a) 8bit+2empty bits or b) full 10bit data in the video stream. >>> You'll probably need to export it to raw YUV or RGB (depending on the >>> input color space) and inspect the least significant bits. This might >>> be easier with a small libav* program than ffmpeg. My first shot would >>> be trying to understand the raw output formats, and to parse them with >>> a pipe to a perl one-liner using unpack(). ;-) >> I pipe the data to xxd for this, such as: >> ffmpeg -i v210.mov -c:v rawvideo -f rawvideo - | xxd -c 2 -b >> >> Since the rawvideo of v210 is 16 bits, I use -c 2 to show the output in 2 >> bytes per row (-c 2). You’ll get an output that looks like this: >> >> 008322e: 11011101 0001 >> 0083230: 01001000 0010 >> >> In the case I’ll see the last two (right most) bits of the first byte >> toggling indicated that it is actually using 10 bits of detail. If the v210 >> was 8 plus two zeros then the last two bits of the first byte would always >> be zero. Unfortunately there is a lot of video hardware that works as 8 bits >> so often those who are intending to digitize analog video to 10 bit are >> actually creating 10 bit files with the least significant bits simply being >> padding. Some digital videotapes also decode to 8 bit but are received over >> 10 bit SDI so this same process can be used to verify if the SDI contains >> actual 10 bit video or some amount of padding. >> Best Regards, >> Dave Rice >> >> ___ >> ffmpeg-user mailing list >> ffmpeg-user@ffmpeg.org >> http://ffmpeg.org/mailman/listinfo/ffmpeg-user > > ___ > ffmpeg-user mailing list > ffmpeg-user@ffmpeg.org > http://ffmpeg.org/mailman/listinfo/ffmpeg-user ___ ffmpeg-user mailing list ffmpeg-user@ffmpeg.org http://ffmpeg.org/mailman/listinfo/ffmpeg-user
Re: [FFmpeg-user] Image Conversion TIFF > JPEG with yuv422 chroma subsampling
On Mon, Jan 19, 2015 at 6:46 PM, Werner Robitza wrote: > ffmpeg -i in.tif -pix_fmt yuv444p -q:v 1 out.jpg > Actually, use yuvj444p instead of yuv444p. ___ ffmpeg-user mailing list ffmpeg-user@ffmpeg.org http://ffmpeg.org/mailman/listinfo/ffmpeg-user
Re: [FFmpeg-user] Image Conversion TIFF > JPEG with yuv422 chroma subsampling
On Mon, Jan 19, 2015 at 6:05 PM, Andrea Rastelli wrote: > $ ffmpeg.exe -pix_fmt yuv422p -i "in.tif" "out.jpg" -q 1 > Set -q before specifying the output filename. -pix_fmt specified before -i will try to read the input with said format. That doesn't make a lot of sense here. Also, if you want yuv444p output, you need to specify yuv444p, not yuv422p, and it needs to be specified after the input file, that is: ffmpeg -i in.tif -pix_fmt yuv444p -q:v 1 out.jpg PS: Please don't top-post. ___ ffmpeg-user mailing list ffmpeg-user@ffmpeg.org http://ffmpeg.org/mailman/listinfo/ffmpeg-user
Re: [FFmpeg-user] X264 and Smooth Text
Haven't tried two-pass encode. But I can't quite use 2 pass encoding in my usage scenario since I'm capturing live. On Mon, Jan 19, 2015 at 6:04 PM, Werner Robitza wrote: > On Mon, Jan 19, 2015 at 7:49 AM, Robert Nagy wrote: > > > However, at the first 1-2 seconds of the video the text looks quite a bit > > worse and then "pops" to better quality. > > > > Is there some setting I can use so that x264 uses a higher bitrate at the > > beginning of a clip as to avoid the "pop"? > > > > I'm surprised that CRF 18 exhibits this kind of rate control issue. Have > you tried a fixed-bitrate two-pass encode? > ___ > ffmpeg-user mailing list > ffmpeg-user@ffmpeg.org > http://ffmpeg.org/mailman/listinfo/ffmpeg-user > ___ ffmpeg-user mailing list ffmpeg-user@ffmpeg.org http://ffmpeg.org/mailman/listinfo/ffmpeg-user
Re: [FFmpeg-user] Image Conversion TIFF > JPEG with yuv422 chroma subsampling
here the uncut command $ ffmpeg.exe -pix_fmt yuv422p -i "//isilon.nas/miame/02_production/00_supervision/03_shot_approval/06_compositing/sc_mm2e14/_Tiff/sq_001/sc_001/pcp_m ia_mm2e14_001_001_v005/pcp_mia_mm2e14_001_001_v005_0067.tif" "//isilon.nas/miame/02_production/02_compositing/test/test_jpeg/pcp_mia_mm2e14_001_001_v 005_0067_yuv422_test_01.jpeg" -q 1 ffmpeg version N-68645-g41ee459 Copyright (c) 2000-2014 the FFmpeg developers built on Dec 21 2014 22:02:40 with gcc 4.9.2 (GCC) configuration: --enable-gpl --enable-version3 --disable-w32threads --enable-avisynth --enable-bzlib --enable-fontconfig --enable-frei0r --enable-gnu tls --enable-iconv --enable-libass --enable-libbluray --enable-libbs2b --enable-libcaca --enable-libfreetype --enable-libgme --enable-libgsm --enable- libilbc --enable-libmodplug --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg --enable-libopus --enable-l ibrtmp --enable-libschroedinger --enable-libsoxr --enable-libspeex --enable-libtheora --enable-libtwolame --enable-libvidstab --enable-libvo-aacenc -- enable-libvo-amrwbenc --enable-libvorbis --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxavs --ena ble-libxvid --enable-decklink --enable-zlib libavutil 54. 15.100 / 54. 15.100 libavcodec 56. 16.100 / 56. 16.100 libavformat56. 16.101 / 56. 16.101 libavdevice56. 3.100 / 56. 3.100 libavfilter 5. 4.100 / 5. 4.100 libswscale 3. 1.101 / 3. 1.101 libswresample 1. 1.100 / 1. 1.100 libpostproc53. 3.100 / 53. 3.100 Trailing options were found on the commandline. [tiff_pipe @ 02c89360] Stream #0: not enough frames to estimate rate; consider increasing probesize Input #0, tiff_pipe, from '//isilon.nas/miame/02_production/00_supervision/03_shot_approval/06_compositing/sc_mm2e14/_Tiff/sq_001/sc_001/pcp_mia_mm2e1 4_001_001_v005/pcp_mia_mm2e14_001_001_v005_0067.tif': Duration: N/A, bitrate: N/A Stream #0:0: Video: tiff, rgb24, 1920x1300 [SAR 1:1 DAR 96:65], 25 tbr, 25 tbn, 25 tbc [swscaler @ 02ca1fc0] deprecated pixel format used, make sure you did set range correctly Output #0, image2, to '//isilon.nas/miame/02_production/02_compositing/test/test_jpeg/pcp_mia_mm2e14_001_001_v005_0067_yuv422_test_01.jpeg': Metadata: encoder : Lavf56.16.101 Stream #0:0: Video: mjpeg, yuvj444p(pc), 1920x1300 [SAR 1:1 DAR 96:65], q=2-31, 200 kb/s, 25 fps, 25 tbn, 25 tbc Metadata: encoder : Lavc56.16.100 mjpeg Stream mapping: Stream #0:0 -> #0:0 (tiff (native) -> mjpeg (native)) Press [q] to stop, [?] for help frame=1 fps=0.0 q=8.5 Lsize=N/A time=00:00:00.04 bitrate=N/A video:162kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: unknown On 19/01/2015 18:03, Werner Robitza wrote: On Mon, Jan 19, 2015 at 5:53 PM, Andrea Rastelli wrote: Hi, I'm trying to convert a TIFF image sequence into JPEG (sequence) for preliminary video analysis, and I need to save the JPEG using yuv444 or yuv442.. but all I have achieved by now is the simple TIFF to JPEG conversion with some setup in the quality setting (that still produce blocky images, even with -q 1 or -q:v 1).. Also, the only codec that works is the MJPEG, any other codec produces unreadable images or extremely slow-to-process images (libopenjpeg).. Please post the command(s) you're using, including the full, uncut command line output. ___ ffmpeg-user mailing list ffmpeg-user@ffmpeg.org http://ffmpeg.org/mailman/listinfo/ffmpeg-user ___ ffmpeg-user mailing list ffmpeg-user@ffmpeg.org http://ffmpeg.org/mailman/listinfo/ffmpeg-user
Re: [FFmpeg-user] X264 and Smooth Text
On Mon, Jan 19, 2015 at 7:49 AM, Robert Nagy wrote: > However, at the first 1-2 seconds of the video the text looks quite a bit > worse and then "pops" to better quality. > > Is there some setting I can use so that x264 uses a higher bitrate at the > beginning of a clip as to avoid the "pop"? > I'm surprised that CRF 18 exhibits this kind of rate control issue. Have you tried a fixed-bitrate two-pass encode? ___ ffmpeg-user mailing list ffmpeg-user@ffmpeg.org http://ffmpeg.org/mailman/listinfo/ffmpeg-user
Re: [FFmpeg-user] Image Conversion TIFF > JPEG with yuv422 chroma subsampling
On Mon, Jan 19, 2015 at 5:53 PM, Andrea Rastelli wrote: > Hi, > > I'm trying to convert a TIFF image sequence into JPEG (sequence) for > preliminary video analysis, and I need to save the JPEG using yuv444 or > yuv442.. but all I have achieved by now is the simple TIFF to JPEG > conversion with some setup in the quality setting (that still produce > blocky images, even with -q 1 or -q:v 1).. > > Also, the only codec that works is the MJPEG, any other codec produces > unreadable images or extremely slow-to-process images (libopenjpeg).. > Please post the command(s) you're using, including the full, uncut command line output. ___ ffmpeg-user mailing list ffmpeg-user@ffmpeg.org http://ffmpeg.org/mailman/listinfo/ffmpeg-user
[FFmpeg-user] Image Conversion TIFF > JPEG with yuv422 chroma subsampling
Hi, I'm trying to convert a TIFF image sequence into JPEG (sequence) for preliminary video analysis, and I need to save the JPEG using yuv444 or yuv442.. but all I have achieved by now is the simple TIFF to JPEG conversion with some setup in the quality setting (that still produce blocky images, even with -q 1 or -q:v 1).. Also, the only codec that works is the MJPEG, any other codec produces unreadable images or extremely slow-to-process images (libopenjpeg).. Any help will be appreciated. Thanks ___ ffmpeg-user mailing list ffmpeg-user@ffmpeg.org http://ffmpeg.org/mailman/listinfo/ffmpeg-user
Re: [FFmpeg-user] How to scale watermark proportionally to width and height of video frame?
> How to scale watermark proportionally video frame size (to width and > to height of video frame)? > > Now I use the following command: > > ffmpeg -i input.mkv -i logo.png -filter_complex > "[1:v]scale=w=iw/3:h=ih/3[watermark_scaled];[0:v][watermark_scaled]overlay=x=main_w-overlay_w-main_w/20:y=main_h-overlay_h-main_w/20" > output.mkv > > I use scale=w=iw/3:h=ih/3, but I can't use "main_w" and "main_h" > variables in this place. E.g. scale=w=main_w*0.05:main_h*0.05 don't > work. How to get video frame width and height to use them for scaling > watermark? Hello, as far as i know, it is not possible. You have to get the video dimension on an outer layer, like a shell script, and pass it to the scale filter. All filters only know about their inputs, not about other filter chains. Something like: streaminfo=`mktemp` ffprobe -v quiet -show_streams -select_streams v:0 input.mkv >$streaminfo width=`grep width $streaminfo | cut -d'=' -f2` height=`grep height $streaminfo | cut -d'=' -f2` ffmpeg -i input.mkv -i logo.png -filter_complex "[1:v]scale=w=$width/3:h=$height/3[watermark_scaled];[0:v][watermark_scaled]overlay=x=main_w-overlay_w-main_w/20:y=main_h-overlay_h-main_w/20" output.mkv rm $streaminfo Greetings, Frank. ___ ffmpeg-user mailing list ffmpeg-user@ffmpeg.org http://ffmpeg.org/mailman/listinfo/ffmpeg-user
Re: [FFmpeg-user] FFMPEG for encoding to Multichannel ALAC
Hi Rashed, On Mon, Jan 19, 2015 at 17:53:44 +0530, Rashed wrote: > C:\AudioTools\ALAC>ffmpeg -i pcmfile_48k_16bit_5.1.wav -acodec alac -ac 6 > out.m4a What happens if you omit "-ac 6"? > Output #0, ipod, to 'out.m4a': > Metadata: > encoder : Lavf56.19.100 > Stream #0:0: Audio: alac (alac / 0x63616C61), 48000 Hz, 5.1, s16p, 128 > kb/s This looks correct. > Channel(s) : 2 channels This doesn't. First of all, please inspect the resulting file out.m4a with "ffprobe" or "ffmpeg -i". There may be a mismatch between the file header and the actual stream. (I recall this having happened with mono versus stereo MPEG audio.) Secondly, please try this. Mediainfo and ffprobe both properly report 6 channels in my resulting file: $ ffmpeg -f lavfi -i "aevalsrc=sin(440*2*PI*t):s=48000:c=5.1" -c:a alac -t 10 out.m4a (And please inspect the resulting file.) The only other difference I can see is that your input file is reported as "6" channels instead of "5.1", with the additional message: > Guessed Channel Layout for Input Stream #0.0 : 5.1 which I can't reproduce, but which seems correct for this purpose anyway. Moritz ___ ffmpeg-user mailing list ffmpeg-user@ffmpeg.org http://ffmpeg.org/mailman/listinfo/ffmpeg-user
[FFmpeg-user] How to scale watermark proportionally to width and height of video frame?
Hi! How to scale watermark proportionally video frame size (to width and to height of video frame)? Now I use the following command: ffmpeg -i input.mkv -i logo.png -filter_complex "[1:v]scale=w=iw/3:h=ih/3[watermark_scaled];[0:v][watermark_scaled]overlay=x=main_w-overlay_w-main_w/20:y=main_h-overlay_h-main_w/20" output.mkv I use scale=w=iw/3:h=ih/3, but I can't use "main_w" and "main_h" variables in this place. E.g. scale=w=main_w*0.05:main_h*0.05 don't work. How to get video frame width and height to use them for scaling watermark? Thanks in advance! ___ ffmpeg-user mailing list ffmpeg-user@ffmpeg.org http://ffmpeg.org/mailman/listinfo/ffmpeg-user
Re: [FFmpeg-user] FFMPEG for encoding to Multichannel ALAC
Sorry, just subscribed to this list. C:\AudioTools\ALAC>ffmpeg -i pcmfile_48k_16bit_5.1.wav -acodec alac -ac 6 out.m4a ffmpeg version N-69146-g90c9899 Copyright (c) 2000-2015 the FFmpeg developers built on Jan 19 2015 01:28:38 with gcc 4.9.2 (GCC) configuration: --enable-gpl --enable-version3 --disable-w32threads --enable-avisynth --enable-bzlib --enable-fontconfig --enable-frei0r --enable-gn utls --enable-iconv --enable-libass --enable-libbluray --enable-libbs2b --enable-libcaca --enable-libfreetype --enable-libgme --enable-libgsm --enabl e-libilbc --enable-libmodplug --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg --enable-libopus --enabl e-librtmp --enable-libschroedinger --enable-libsoxr --enable-libspeex --enable-libtheora --enable-libtwolame --enable-libvidstab --enable-libvo-aacen c --enable-libvo-amrwbenc --enable-libvorbis --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxavs --enable-libxvid --enable-lzma --enable-decklink --enable-zlib libavutil 54. 17.100 / 54. 17.100 libavcodec 56. 20.100 / 56. 20.100 libavformat56. 19.100 / 56. 19.100 libavdevice56. 4.100 / 56. 4.100 libavfilter 5. 8.100 / 5. 8.100 libswscale 3. 1.101 / 3. 1.101 libswresample 1. 1.100 / 1. 1.100 libpostproc53. 3.100 / 53. 3.100 Guessed Channel Layout for Input Stream #0.0 : 5.1 Input #0, wav, from 'pcmfile_48k_16bit_5.1.wav': Duration: 00:02:50.14, bitrate: 4608 kb/s Stream #0:0: Audio: pcm_s16le ([1][0][0][0] / 0x0001), 48000 Hz, 6 channels, s16, 4608 kb/s File 'out.m4a' already exists. Overwrite ? [y/N] y Output #0, ipod, to 'out.m4a': Metadata: encoder : Lavf56.19.100 Stream #0:0: Audio: alac (alac / 0x63616C61), 48000 Hz, 5.1, s16p, 128 kb/s Metadata: encoder : Lavc56.20.100 alac Stream mapping: Stream #0:0 -> #0:0 (pcm_s16le (native) -> alac (native)) Press [q] to stop, [?] for help size= 20640kB time=00:02:50.15 bitrate= 993.7kbits/s video:0kB audio:20631kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 0.042673% C:\AudioTools\ALAC>mediainfo out.m4a General Complete name: out.m4a Format : MPEG-4 Format profile : Apple audio with iTunes info Codec ID : M4A File size: 20.2 MiB Duration : 2mn 50s Overall bit rate mode: Variable Overall bit rate : 994 Kbps Writing application : Lavf56.19.100 Audio ID : 1 Format : ALAC Codec ID : alac Codec ID/Info: Apple Lossless Format Duration : 2mn 50s Duration_LastFrame : -15ms Bit rate mode: Variable Bit rate : 993 Kbps Channel(s) : 2 channels Sampling rate: 48.0 KHz Bit depth: 16 bits Stream size : 20.1 MiB (100%) On Mon, Jan 19, 2015 at 5:41 PM, Moritz Barsnick wrote: > Hi Rashed, > > On Mon, Jan 19, 2015 at 17:22:18 +0530, Rashed wrote: > > I am trying to generate multichannel ALAC content using FFMPEG but > somehow > > is seem to be getting only up to stereo. Is this a limitation of FFMPEG > or > > am i doing something incorrectly. > > > > ffmpeg -i pcmfile_48k_16bit_5.1.wav -acodec alac -ac 6 out.m4a > > Could you please, as always requested here, show us the complete, uncut > console output from this command? > > Everything else is just guesswork. > > Moritz > ___ > ffmpeg-user mailing list > ffmpeg-user@ffmpeg.org > http://ffmpeg.org/mailman/listinfo/ffmpeg-user > ___ ffmpeg-user mailing list ffmpeg-user@ffmpeg.org http://ffmpeg.org/mailman/listinfo/ffmpeg-user
Re: [FFmpeg-user] FFMPEG for encoding to Multichannel ALAC
Hi Rashed, On Mon, Jan 19, 2015 at 17:22:18 +0530, Rashed wrote: > I am trying to generate multichannel ALAC content using FFMPEG but somehow > is seem to be getting only up to stereo. Is this a limitation of FFMPEG or > am i doing something incorrectly. > > ffmpeg -i pcmfile_48k_16bit_5.1.wav -acodec alac -ac 6 out.m4a Could you please, as always requested here, show us the complete, uncut console output from this command? Everything else is just guesswork. Moritz ___ ffmpeg-user mailing list ffmpeg-user@ffmpeg.org http://ffmpeg.org/mailman/listinfo/ffmpeg-user
[FFmpeg-user] FFMPEG for encoding to Multichannel ALAC
Hi Folks, I am trying to generate multichannel ALAC content using FFMPEG but somehow is seem to be getting only up to stereo. Is this a limitation of FFMPEG or am i doing something incorrectly. ffmpeg -i pcmfile_48k_16bit_5.1.wav -acodec alac -ac 6 out.m4a Thanks. ___ ffmpeg-user mailing list ffmpeg-user@ffmpeg.org http://ffmpeg.org/mailman/listinfo/ffmpeg-user
Re: [FFmpeg-user] How can I determine if a 10bit videofile has full 10bit video data or 8bit (+ 2bits zeros) data
Hello Dave, I tried it on ubuntu. It works. But, can you explain me: Why it is the last 2 bits of the first byte? Shouldnt it be the first 2 bits of the last byte? In my understanding, 8 bit are 8 digits -> first byte should be always full. (?) But maybe this only is for RGB correct and not for YUV? br Christoph Am 16.01.2015 um 16:40 schrieb Dave Rice: Hi Christoph, On Jan 16, 2015, at 10:03 AM, Moritz Barsnick wrote: On Fri, Jan 16, 2015 at 14:10:38 +0100, Christoph Gerstbauer wrote: I am searching for a possibility to check if a 10bit 4:2:2 videofile (v210 codec or ffvhuff codec) has a) 8bit+2empty bits or b) full 10bit data in the video stream. You'll probably need to export it to raw YUV or RGB (depending on the input color space) and inspect the least significant bits. This might be easier with a small libav* program than ffmpeg. My first shot would be trying to understand the raw output formats, and to parse them with a pipe to a perl one-liner using unpack(). ;-) I pipe the data to xxd for this, such as: ffmpeg -i v210.mov -c:v rawvideo -f rawvideo - | xxd -c 2 -b Since the rawvideo of v210 is 16 bits, I use -c 2 to show the output in 2 bytes per row (-c 2). You’ll get an output that looks like this: 008322e: 11011101 0001 0083230: 01001000 0010 In the case I’ll see the last two (right most) bits of the first byte toggling indicated that it is actually using 10 bits of detail. If the v210 was 8 plus two zeros then the last two bits of the first byte would always be zero. Unfortunately there is a lot of video hardware that works as 8 bits so often those who are intending to digitize analog video to 10 bit are actually creating 10 bit files with the least significant bits simply being padding. Some digital videotapes also decode to 8 bit but are received over 10 bit SDI so this same process can be used to verify if the SDI contains actual 10 bit video or some amount of padding. Best Regards, Dave Rice ___ ffmpeg-user mailing list ffmpeg-user@ffmpeg.org http://ffmpeg.org/mailman/listinfo/ffmpeg-user ___ ffmpeg-user mailing list ffmpeg-user@ffmpeg.org http://ffmpeg.org/mailman/listinfo/ffmpeg-user
Re: [FFmpeg-user] How can I determine if a 10bit videofile has full 10bit video data or 8bit (+ 2bits zeros) data
Thank you, Dave! As I guess, this commandline is just working on linux, right? I tried it on windows but: ffmpeg -i I:\_10bit_PERFORMANCE_TESTS\analog_tape_records\10bit_v210_captured_via_SDI-8bit.mov -c:v rawvideo -f rawvideo - | xxd -c 2 -b 'xxd' is not recognized as an internal or external command, operable program or batch file. The whole thing I am trying to do is: ffv1 speed/cpu load tests with 10bit sources. But first I have to be 100 percent shure that the v210 files I am generating with SDI capturing are real 10bit sources. I have several "10bit"-believing files (v210/AVC-Intra for example) but I was not the creator of them. If in their generation chain was just one point where 8bit was used, the 10bit information is lost. And thats why I can just believe that it is 10bit. I am capturing from a IMX VTR which allows to set the SDI bitdepth for the SDI output (8bit/10bit). SO I can directly control that the final captured v210 file will have 8bit or 10bit information (capturing via a AJA Kona card). So, for your mentioned method, I will need linux. Right? Addionally: As far as I know, 10bit ffv1 compression rates are better than 8bit. SO a "8bit"-v210 file is a little bit larger than a "10bit"-v210 file. Do you know why? Best Regards Christoph Am 16.01.2015 um 16:40 schrieb Dave Rice: Hi Christoph, On Jan 16, 2015, at 10:03 AM, Moritz Barsnick wrote: On Fri, Jan 16, 2015 at 14:10:38 +0100, Christoph Gerstbauer wrote: I am searching for a possibility to check if a 10bit 4:2:2 videofile (v210 codec or ffvhuff codec) has a) 8bit+2empty bits or b) full 10bit data in the video stream. You'll probably need to export it to raw YUV or RGB (depending on the input color space) and inspect the least significant bits. This might be easier with a small libav* program than ffmpeg. My first shot would be trying to understand the raw output formats, and to parse them with a pipe to a perl one-liner using unpack(). ;-) I pipe the data to xxd for this, such as: ffmpeg -i v210.mov -c:v rawvideo -f rawvideo - | xxd -c 2 -b Since the rawvideo of v210 is 16 bits, I use -c 2 to show the output in 2 bytes per row (-c 2). You’ll get an output that looks like this: 008322e: 11011101 0001 0083230: 01001000 0010 In the case I’ll see the last two (right most) bits of the first byte toggling indicated that it is actually using 10 bits of detail. If the v210 was 8 plus two zeros then the last two bits of the first byte would always be zero. Unfortunately there is a lot of video hardware that works as 8 bits so often those who are intending to digitize analog video to 10 bit are actually creating 10 bit files with the least significant bits simply being padding. Some digital videotapes also decode to 8 bit but are received over 10 bit SDI so this same process can be used to verify if the SDI contains actual 10 bit video or some amount of padding. Best Regards, Dave Rice ___ ffmpeg-user mailing list ffmpeg-user@ffmpeg.org http://ffmpeg.org/mailman/listinfo/ffmpeg-user ___ ffmpeg-user mailing list ffmpeg-user@ffmpeg.org http://ffmpeg.org/mailman/listinfo/ffmpeg-user
