উবুন্টু 14.04-এ ffmpeg ব্যবহার করে আমার একটি অদ্ভুত সমস্যা হয়েছিল। আমি একটি কমান্ড চালাচ্ছি
ffmpeg -i output2.avi -c:v h264 -minrate 2000k -maxrate 5000k -bufsize 2000k -profile:v high -level:v 4 -coder 1 -s 640x360 -bf 0 -pix_fmt yuv420p -r 25 -g 25 -c:a aac -ar 48k -b:a 321k -map 0 -y outpu.mp4
এটি কনসোলে এ জাতীয় স্বাভাবিক আউটপুট সরবরাহ করে (ইতিমধ্যে-লোগেভেল ভার্বোস সহ):
ffmpeg version N-79004-g2e6636a Copyright (c) 2000-2016 the FFmpeg developers
built with gcc 4.8 (Ubuntu 4.8.4-2ubuntu1~14.04)
configuration: --prefix=/home/ngoral/ffmpeg_build --pkg-config-flags=--static --extra-cflags=-I/home/ngoral/ffmpeg_build/include --extra-ldflags=-L/home/ngoral/ffmpeg_build/lib --bindir=/home/ngoral/bin --enable-gpl --enable-libass --enable-libfdk-aac --enable-libfreetype --enable-libmp3lame --enable-libtheora --enable-libvorbis --enable-libx264 --enable-nonfree
libavutil 55. 19.100 / 55. 19.100
libavcodec 57. 28.101 / 57. 28.101
libavformat 57. 28.101 / 57. 28.101
libavdevice 57. 0.101 / 57. 0.101
libavfilter 6. 39.102 / 6. 39.102
libswscale 4. 0.100 / 4. 0.100
libswresample 2. 0.101 / 2. 0.101
libpostproc 54. 0.100 / 54. 0.100
[avi @ 0x2707800] parser not found for codec dvvideo, packets or times may be invalid.
Last message repeated 1 times
Input #0, avi, from 'output2.avi':
Metadata:
encoder : Lavf57.28.101
Duration: 00:00:20.04, start: 0.000000, bitrate: 28911 kb/s
Stream #0:0: Video: dvvideo, 1 reference frame (dvsd / 0x64737664), yuv420p, 720x576 [SAR 16:15 DAR 4:3], 28684 kb/s, 25 fps, 25 tbr, 25 tbn, 25 tbc
Stream #0:1: Audio: mp3 (U[0][0][0] / 0x0055), 48000 Hz, stereo, s16p, 192 kb/s
Stream #0:2: Audio: mp3 (U[0][0][0] / 0x0055), 48000 Hz, stereo, s16p, 64 kb/s
Stream #0:3: Audio: aac ([255][0][0][0] / 0x00FF), 48000 Hz, stereo, fltp, 117 kb/s
Matched encoder 'libx264' for codec 'h264'.
[graph 0 input from stream 0:0 @ 0x2784f60] w:720 h:576 pixfmt:yuv420p tb:1/25 fr:25/1 sar:16/15 sws_param:flags=2
[scaler for output stream 0:0 @ 0x2749d20] w:640 h:360 flags:'bicubic' interl:0
[scaler for output stream 0:0 @ 0x2749d20] w:720 h:576 fmt:yuv420p sar:16/15 -> w:640 h:360 fmt:yuv420p sar:3/4 flags:0x4
[graph 1 input from stream 0:1 @ 0x27a4fc0] tb:1/48000 samplefmt:s16p samplerate:48000 chlayout:0x3
[audio format for output stream 0:1 @ 0x27a5380] auto-inserting filter 'auto-inserted resampler 0' between the filter 'Parsed_anull_0' and the filter 'audio format for output stream 0:1'
[auto-inserted resampler 0 @ 0x27a7ae0] ch:2 chl:stereo fmt:s16p r:48000Hz -> ch:2 chl:stereo fmt:fltp r:48000Hz
[graph 2 input from stream 0:2 @ 0x27a6620] tb:1/48000 samplefmt:s16p samplerate:48000 chlayout:0x3
[audio format for output stream 0:2 @ 0x27a6440] auto-inserting filter 'auto-inserted resampler 0' between the filter 'Parsed_anull_0' and the filter 'audio format for output stream 0:2'
[auto-inserted resampler 0 @ 0x27b6be0] ch:2 chl:stereo fmt:s16p r:48000Hz -> ch:2 chl:stereo fmt:fltp r:48000Hz
[graph 3 input from stream 0:3 @ 0x27b6560] tb:1/48000 samplefmt:fltp samplerate:48000 chlayout:0x3
[libx264 @ 0x27889a0] using SAR=3/4
[libx264 @ 0x27889a0] using cpu capabilities: MMX2 SSE2Fast SSSE3 SSE4.2 AVX
[libx264 @ 0x27889a0] profile High, level 4.0
[libx264 @ 0x27889a0] 264 - core 148 r2643 5c65704 - H.264/MPEG-4 AVC codec - Copyleft 2003-2015 - 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=6 lookahead_threads=1 sliced_threads=0 nr=0 decimate=1 interlaced=0 bluray_compat=0 constrained_intra=0 bframes=0 weightp=2 keyint=25 keyint_min=2 scenecut=40 intra_refresh=0 rc_lookahead=25 rc=crf mbtree=1 crf=23.0 qcomp=0.60 qpmin=0 qpmax=69 qpstep=4 vbv_maxrate=5000 vbv_bufsize=2000 crf_max=0.0 nal_hrd=none filler=0 ip_ratio=1.40 aq=1:1.00
Output #0, mp4, to 'outpu.mp4':
Metadata:
encoder : Lavf57.28.101
Stream #0:0: Video: h264 (libx264), -1 reference frame ([33][0][0][0] / 0x0021), yuv420p, 640x360 [SAR 3:4 DAR 4:3], q=-1--1, max. 5000 kb/s, 25 fps, 12800 tbn, 25 tbc
Metadata:
encoder : Lavc57.28.101 libx264
Side data:
cpb: bitrate max/min/avg: 5000000/0/0 buffer size: 2000000 vbv_delay: -1
Stream #0:1: Audio: aac (LC) ([64][0][0][0] / 0x0040), 48000 Hz, stereo, fltp, 321 kb/s
Metadata:
encoder : Lavc57.28.101 aac
Stream #0:2: Audio: aac (LC) ([64][0][0][0] / 0x0040), 48000 Hz, stereo, fltp, 321 kb/s
Metadata:
encoder : Lavc57.28.101 aac
Stream #0:3: Audio: aac (LC) ([64][0][0][0] / 0x0040), 48000 Hz, stereo, fltp, 321 kb/s
Metadata:
encoder : Lavc57.28.101 aac
Stream mapping:
Stream #0:0 -> #0:0 (dvvideo (native) -> h264 (libx264))
Stream #0:1 -> #0:1 (mp3 (native) -> aac (native))
Stream #0:2 -> #0:2 (mp3 (native) -> aac (native))
Stream #0:3 -> #0:3 (aac (native) -> aac (native))
Press [q] to stop, [?] for help
*** 3 dup!
No more output streams to write to, finishing.e=00:00:19.84 bitrate= 359.9kbits/s dup=3 drop=0 speed=1.15x
frame= 501 fps= 29 q=-1.0 Lsize= 1792kB time=00:00:20.05 bitrate= 732.2kbits/s dup=3 drop=0 speed=1.14x
video:440kB audio:1331kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 1.155376%
Input file #0 (output2.avi):
Input stream #0:0 (video): 498 packets read (71712000 bytes); 498 frames decoded;
Input stream #0:1 (audio): 834 packets read (480384 bytes); 834 frames decoded (960768 samples);
Input stream #0:2 (audio): 835 packets read (160320 bytes); 835 frames decoded (961920 samples);
Input stream #0:3 (audio): 0 packets read (0 bytes); 0 frames decoded (0 samples);
Total: 2167 packets (72352704 bytes) demuxed
Output file #0 (outpu.mp4):
Output stream #0:0 (video): 501 frames encoded; 501 packets muxed (451055 bytes);
Output stream #0:1 (audio): 939 frames encoded (960768 samples); 940 packets muxed (724261 bytes);
Output stream #0:2 (audio): 940 frames encoded (961920 samples); 941 packets muxed (639072 bytes);
Output stream #0:3 (audio): 0 frames encoded (0 samples); 0 packets muxed (0 bytes);
Total: 2382 packets (1814388 bytes) muxed
[libx264 @ 0x27889a0] frame I:21 Avg QP:15.30 size: 8718
[libx264 @ 0x27889a0] frame P:480 Avg QP:24.52 size: 557
[libx264 @ 0x27889a0] mb I I16..4: 20.4% 55.5% 24.1%
[libx264 @ 0x27889a0] mb P I16..4: 0.0% 0.1% 0.0% P16..4: 7.6% 3.7% 1.7% 0.0% 0.0% skip:86.8%
[libx264 @ 0x27889a0] 8x8 transform intra:56.3% inter:50.3%
[libx264 @ 0x27889a0] coded y,uvDC,uvAC intra: 42.0% 39.5% 27.5% inter: 2.6% 1.4% 0.0%
[libx264 @ 0x27889a0] i16 v,h,dc,p: 36% 52% 3% 10%
[libx264 @ 0x27889a0] i8 v,h,dc,ddl,ddr,vr,hd,vl,hu: 56% 20% 14% 2% 1% 1% 2% 2% 2%
[libx264 @ 0x27889a0] i4 v,h,dc,ddl,ddr,vr,hd,vl,hu: 42% 26% 7% 4% 3% 4% 5% 5% 4%
[libx264 @ 0x27889a0] i8c dc,h,v,p: 66% 13% 17% 4%
[libx264 @ 0x27889a0] Weighted P-Frames: Y:0.0% UV:0.0%
[libx264 @ 0x27889a0] ref P L0: 68.1% 11.5% 13.9% 6.5%
[libx264 @ 0x27889a0] kb/s:179.78
[aac @ 0x2747da0] Qavg: 62719.090
[aac @ 0x2748b20] Qavg: 64509.496
[aac @ 0x27498a0] Qavg: -nan
দেখে মনে হচ্ছে এটি সমস্ত 3 অডিওস্ট্রিমে আউটপুট করে তবে আমি তা করি
ffmpeg -loglevel verbose -i outpu.mp4
এবং মাত্র ২ টি অডিওস্ট্রিম পান:
ffmpeg version N-79004-g2e6636a Copyright (c) 2000-2016 the FFmpeg developers
built with gcc 4.8 (Ubuntu 4.8.4-2ubuntu1~14.04)
configuration: --prefix=/home/ngoral/ffmpeg_build --pkg-config-flags=--static --extra-cflags=-I/home/ngoral/ffmpeg_build/include --extra-ldflags=-L/home/ngoral/ffmpeg_build/lib --bindir=/home/ngoral/bin --enable-gpl --enable-libass --enable-libfdk-aac --enable-libfreetype --enable-libmp3lame --enable-libtheora --enable-libvorbis --enable-libx264 --enable-nonfree
libavutil 55. 19.100 / 55. 19.100
libavcodec 57. 28.101 / 57. 28.101
libavformat 57. 28.101 / 57. 28.101
libavdevice 57. 0.101 / 57. 0.101
libavfilter 6. 39.102 / 6. 39.102
libswscale 4. 0.100 / 4. 0.100
libswresample 2. 0.101 / 2. 0.101
libpostproc 54. 0.100 / 54. 0.100
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'outpu.mp4':
Metadata:
major_brand : isom
minor_version : 512
compatible_brands: isomiso2avc1mp41
encoder : Lavf57.28.101
Duration: 00:00:20.06, start: 0.021333, bitrate: 731 kb/s
Stream #0:0(und): Video: h264 (High), 3 reference frames (avc1 / 0x31637661), yuv420p, 640x360 (640x368) [SAR 3:4 DAR 4:3], 180 kb/s, 25 fps, 25 tbr, 12800 tbn, 50 tbc (default)
Metadata:
handler_name : VideoHandler
Stream #0:1(und): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 289 kb/s (default)
Metadata:
handler_name : SoundHandler
Stream #0:2(und): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 254 kb/s
Metadata:
handler_name : SoundHandler
এতে দোষ কী? এটি আমার উইন মেশিনে, উবুন্টু সহ ভার্চুয়াল মেশিনে দুর্দান্ত কাজ করে তবে বাস্তব উবুন্টুতে এটি যেমন আচরণ করে তেমনি এটি কার্যকর হয়। তোমার কোন ধারনা আছে? ধন্যবাদ!
ffmpeg -i output2.avi