Ajout d'une large partie du code nécessaire à l'extraction des sous-titres via OCR.

removeads.py

@@ -27,15 +27,143 @@ from shutil import copyfile, which
 
 def checkRequiredTools():
     logger = logging.getLogger(__name__)
+    allOptionalTools = True
+    paths = {}
     required = ['ffmpeg', 'ffprobe', 'mkvmerge']
-    optional = ['mkvextract', 'vobsubocr']
+    optional = ['mkvextract', 'vobsubocr','tesseract']
     for tool in required:
-        if which(tool) == None:
+        path = which(tool)
+        if  path == None:
             logger.error('Required tool: %s is missing.' % tool)
             exit(-1)
+        else:
+            paths[tool] = path 
     for tool in optional:
-        if which(tool) == None:
+        path = which(tool)
+        if path == None:
             logger.info('Optional tool: %s is missing.' % tool)
+            allOptionalTools = False
+        else:
+            paths[tool] = path
+
+    return allOptionalTools, paths
+
+def getTesseractSupportedLang(tesseract):
+    logger = logging.getLogger(__name__)
+    res = {}
+
+    with Popen([tesseract, '--list-langs'], stdout=PIPE) as tesseract:
+        for line in tesseract.stdout:
+            line = line.decode('utf8')
+            p = re.compile('(?P<lang>[a-z]{3})\n')
+            m = re.match(p,line)
+            if m != None:
+                try:
+                    lang = m.group('lang')
+                    key = Lang(lang)
+                    res[key] = lang
+                except InvalidLanguageValue as e:
+                    pass
+
+    tesseract.wait()
+    
+    if tesseract.returncode != 0:
+        logger.error("Tesseract returns an error code: %d" % tesseract.returncode)
+        return None
+
+    return res
+
+
+def getSubTitlesTracks(ffprobe, mkvPath):
+    logger = logging.getLogger(__name__)
+    tracks={}
+
+    nbSubTitles = 0
+    with Popen([ffprobe, '-loglevel', 'quiet', '-select_streams', 's', '-show_entries', 'stream=index,codec_name:stream_tags=language', '-of', 'json', mkvPath], stdout=PIPE) as ffprobe:
+        out, _ = ffprobe.communicate()
+        out = json.load(BytesIO(out))
+        if 'streams' in out:
+            for stream in out['streams']:
+                index = stream['index']
+                codec = stream['codec']
+                lang = stream['tags']['language']
+                if codec == 'dvd_subtitle':
+                    if lang not in tracks:
+                        tracks[lang] = [track]
+                    else:
+                        l = tracks[lang]
+                        l.append(track)
+                        tracks[lang] = l  
+        else:
+            return None
+            
+    ffprobe.wait()
+    
+    if ffprobe.returncode != 0:
+        logger.error("ffprobe returns an error code: %d" % ffprobe.returncode)
+        return None
+    
+    return tracks
+
+def extractSRT(mkvextract, mkvPath, destPath, tracks, langs):
+    logger = logging.getLogger(__name__)
+    params = [mkvextract, mkvPath, 'tracks']
+    
+    res = []
+
+    for lang in tracks:
+        iso = Lang(lang)
+        
+        if iso in langs:
+            ocrlang = langs[iso]
+        else:
+            logger.warning("Language not supported by Tesseract: %s" % iso.name)
+            ocrlang ='osd'
+            
+        if len(tracks[lang]) == 1:
+                params.append('%d:%s/%s' % (tracks[lang][0], destPath ,lang))
+                res.append(('%s/%s.idx' % (destPath, lang), lang, ocrlang))
+        else:
+            count = 1
+            for track in tracks[lang]:
+                params.append('%d:%s/%s-%d' % (track, destPath, lang, count))
+                res.append(('%s/%s-%d.idx' % (destPath, lang,count), lang, ocrlang))
+                count = count+1
+
+    with Popen(params) as extract:
+        extract.wait()
+        
+    if extract.returncode != 0:
+        print("Erreur de mkvextract: %d" % extract.returncode)
+    else:
+        print("Extracted")
+
+    return res
+
+def doOCR(vobsubocr, idxs):
+    res = []
+    
+    for filename, lang, iso in idxs:
+        print(filename)
+        srtname =  '%s.srt' % os.path.splitext(filename)[0]
+        print(srtname)
+        # Tesseract reconnaît la chaîne de caractères ... comme le texte 'su'
+        p = re.compile('^su\n$')
+
+        if not os.path.isfile(srtname):
+            with open(srtname, 'w+') as srt:
+                with Popen([vobsubocr, '--lang', iso, filename], stdout=PIPE) as ocr:
+                    for line in ocr.stdout:
+                        line = line.decode('utf8')
+                        m = re.match(p,line)
+                        if m != None:
+                            srt.write('...')
+                        else:
+                            srt.write(line)
+        res.append((srtname, lang))
+
+    return res
+
 
 
 @unique
@@ -59,13 +187,13 @@ class SupportedFormat(IntEnum):
 # ffmpeg -i <InputFile (before concatenation)> -c:v copy -an -sn -bsf:v trace_headers -t 0.01 -report -loglevel 0 -f null -
 
 
-def getFormat(inputFile):
+def getFormat(ffprobe, inputFile):
     logger = logging.getLogger(__name__)
         
     infd = inputFile.fileno()
     inputFile.seek(0,0)
     set_inheritable(infd, True)
-    with Popen(['ffprobe', '-loglevel', 'quiet', '-show_format', '-of', 'json', '-i', '/proc/self/fd/%d' % infd], stdout=PIPE, close_fds=False) as ffprobe:
+    with Popen([ffprobe, '-loglevel', 'quiet', '-show_format', '-of', 'json', '-i', '/proc/self/fd/%d' % infd], stdout=PIPE, close_fds=False) as ffprobe:
         out, _ = ffprobe.communicate()
         out = json.load(BytesIO(out))
         if 'format' in out:
@@ -75,13 +203,13 @@ def getFormat(inputFile):
 
     return None
 
-def getStreams(inputFile):
+def getStreams(ffprobe, inputFile):
     logger = logging.getLogger(__name__)
         
     infd = inputFile.fileno()
     inputFile.seek(0,0)
     set_inheritable(infd, True)
-    with Popen(['ffprobe', '-loglevel', 'quiet', '-show_streams', '-of', 'json', '-i', '/proc/self/fd/%d' % infd], stdout=PIPE, close_fds=False) as ffprobe:
+    with Popen([ffprobe, '-loglevel', 'quiet', '-show_streams', '-of', 'json', '-i', '/proc/self/fd/%d' % infd], stdout=PIPE, close_fds=False) as ffprobe:
         out, _ = ffprobe.communicate()
         out = json.load(BytesIO(out))
         if 'streams' in out:
@@ -216,7 +344,7 @@ def compareTimeInterval(interval1, interval2):
 
 
 
-def ffmpegConvert(inputFile, inputFormat, outputFile, outputFormat, duration):
+def ffmpegConvert(ffmpeg, inputFile, inputFormat, outputFile, outputFormat, duration):
     logger = logging.getLogger(__name__)
     
     infd = inputFile.fileno()
@@ -224,7 +352,7 @@ def ffmpegConvert(inputFile, inputFormat, outputFile, outputFormat, duration):
     set_inheritable(infd, True)
     set_inheritable(outfd, True)
     # TODO: canvas size to be fixed !
-    with Popen(['ffmpeg', '-y', '-loglevel', 'quiet', '-progress', '/dev/stdout', '-canvas_size', '720x560', '-f', inputFormat, '-i', '/proc/self/fd/%d' % infd, 
+    with Popen([ffmpeg, '-y', '-loglevel', 'quiet', '-progress', '/dev/stdout', '-canvas_size', '720x560', '-f', inputFormat, '-i', '/proc/self/fd/%d' % infd, 
                 '-map', '0:v', '-map', '0:a', '-map', '0:s', '-bsf:v', 'h264_mp4toannexb,dump_extra=freq=keyframe', '-vcodec', 'copy', '-acodec', 'copy', '-scodec', 'dvdsub', 
                 '-f', outputFormat, '/proc/self/fd/%d' % outfd], stdout=PIPE, close_fds=False) as ffmpeg:
         pb = tqdm(TextIOWrapper(ffmpeg.stdout, encoding="utf-8"), total=int(duration/timedelta(seconds=1)), unit='s', desc='Conversion')
@@ -262,12 +390,12 @@ def getPacketDuration(packet):
     return duration
     
 
-def getFramesInStream(inputFile, begin, end, streamKind, subStreamId=0):
+def getFramesInStream(ffprobe, inputFile, begin, end, streamKind, subStreamId=0):
     logger = logging.getLogger(__name__)
     infd = inputFile.fileno()
     set_inheritable(infd, True)
     
-    with Popen(['ffprobe', '-loglevel', 'quiet', '-read_intervals', ('%s%%%s' %(begin, end)), '-show_entries', 'frame', '-select_streams', '%s:%d' % (streamKind, subStreamId), '-of', 'json', '/proc/self/fd/%d' % infd], stdout=PIPE, close_fds=False) as ffprobe:
+    with Popen([ffprobe, '-loglevel', 'quiet', '-read_intervals', ('%s%%%s' %(begin, end)), '-show_entries', 'frame', '-select_streams', '%s:%d' % (streamKind, subStreamId), '-of', 'json', '/proc/self/fd/%d' % infd], stdout=PIPE, close_fds=False) as ffprobe:
         out, _ = ffprobe.communicate()
         frames = json.load(BytesIO(out))
         status = ffprobe.wait()
@@ -288,7 +416,7 @@ def getFramesInStream(inputFile, begin, end, streamKind, subStreamId=0):
            logger.error('Impossible to retrieve frames inside file around [%s,%s]' % (begin, end))
            return None
 
-def getNearestIFrame(inputFile, timestamp, before=True, delta=timedelta(seconds=2)):
+def getNearestIFrame(ffprobe, inputFile, timestamp, before=True, delta=timedelta(seconds=2)):
     logger = logging.getLogger(__name__)
     
     zero = timedelta()
@@ -302,7 +430,7 @@ def getNearestIFrame(inputFile, timestamp, before=True, delta=timedelta(seconds=
     
     logger.debug('Looking for iframe in [%s, %s]' % (tbegin, tend))
     
-    frames = getFramesInStream(inputFile=inputFile, begin=tbegin, end=tend, streamKind='v')
+    frames = getFramesInStream(ffprobe, inputFile=inputFile, begin=tbegin, end=tend, streamKind='v')
     if frames == None:
         return None
     
@@ -352,7 +480,7 @@ def getNearestIFrame(inputFile, timestamp, before=True, delta=timedelta(seconds=
             
     return(nbFrames, iframe)
 
-def extractMKVPart(inputFile, outputFile, begin, end):
+def extractMKVPart(mkvmerge, inputFile, outputFile, begin, end):
     logger = logging.getLogger(__name__)
     
     logger.info('Extract video between I-frames at %s and %s' % (begin,end))
@@ -363,7 +491,7 @@ def extractMKVPart(inputFile, outputFile, begin, end):
     set_inheritable(infd, True)
     set_inheritable(outfd, True)
     warnings = []
-    with Popen(['mkvmerge', '-o', '/proc/self/fd/%d' % outfd, '--split', 'parts:%s-%s' % (begin, end), '/proc/self/fd/%d' % infd], stdout=PIPE, close_fds=False) as mkvmerge:
+    with Popen([mkvmerge, '-o', '/proc/self/fd/%d' % outfd, '--split', 'parts:%s-%s' % (begin, end), '/proc/self/fd/%d' % infd], stdout=PIPE, close_fds=False) as mkvmerge:
         pb = tqdm(TextIOWrapper(mkvmerge.stdout, encoding="utf-8"), total=100, unit='%', desc='Extraction')
         for line in pb:
             if line.startswith('Progression :'):
@@ -371,10 +499,13 @@ def extractMKVPart(inputFile, outputFile, begin, end):
                 m = p.match(line)
                 if m == None:
                     logger.error('Impossible to parse progress')
-                pb.n = int(m['progress'])
-                pb.update()
+                pb.update(int(m['progress'])-pb.n)
             elif line.startswith('Avertissement'):
                 warnings.append(line)
+        pb.update(100-pb.n)
+        pb.refresh()
+        pb.close()
+        
                 
         status = mkvmerge.wait()
         if status == 1:
@@ -383,9 +514,9 @@ def extractMKVPart(inputFile, outputFile, begin, end):
                 logger.warning(w)
         elif status == 2:
             logger.error('Extraction returns errors')
+
         
-        
-def extractPictures(inputFile, begin, nbFrames, width=640, height=480):
+def extractPictures(ffmpeg, inputFile, begin, nbFrames, width=640, height=480):
     logger = logging.getLogger(__name__)
         
     inputFile.seek(0,0)
@@ -401,7 +532,7 @@ def extractPictures(inputFile, begin, nbFrames, width=640, height=480):
     logger.debug("Estimated length: %d" % length)
     
     images = bytes()
-    with Popen(['ffmpeg', '-loglevel', 'quiet' ,'-y', '-ss', '%s'%begin, '-i', '/proc/self/fd/%d' % infd, '-s', '%dx%d'%(width, height), '-vframes', '%d'%nbFrames, '-c:v', 'ppm', '-f', 'image2pipe', '/proc/self/fd/%d' % outfd ], stdout=PIPE, close_fds=False) as ffmpeg:
+    with Popen([ffmpeg, '-loglevel', 'quiet' ,'-y', '-ss', '%s'%begin, '-i', '/proc/self/fd/%d' % infd, '-s', '%dx%d'%(width, height), '-vframes', '%d'%nbFrames, '-c:v', 'ppm', '-f', 'image2pipe', '/proc/self/fd/%d' % outfd ], stdout=PIPE, close_fds=False) as ffmpeg:
         status = ffmpeg.wait()
         if status != 0:
             logger.error('Conversion failed with status code: %d' % status)
@@ -416,7 +547,7 @@ def extractPictures(inputFile, begin, nbFrames, width=640, height=480):
     lseek(outfd, 0, SEEK_SET)
     return images, outfd
 
-def extractSound(inputFile, begin, outputFileName, packetDuration, subChannel=0, nbPackets=0, sampleRate=48000, nbChannels=2):
+def extractSound(ffmpeg, inputFile, begin, outputFileName, packetDuration, subChannel=0, nbPackets=0, sampleRate=48000, nbChannels=2):
     logger = logging.getLogger(__name__)
     
     inputFile.seek(0,0)
@@ -427,7 +558,7 @@ def extractSound(inputFile, begin, outputFileName, packetDuration, subChannel=0,
     sound = bytes()
     length = int(nbChannels*sampleRate*4*nbPackets*packetDuration/1000)
     
-    with Popen(['ffmpeg', '-y', '-loglevel', 'quiet', '-ss', '%s'%begin, '-i', '/proc/self/fd/%d' % infd, '-frames:a:%d' % subChannel, '%d' % (nbPackets+1), 
+    with Popen([ffmpeg, '-y', '-loglevel', 'quiet', '-ss', '%s'%begin, '-i', '/proc/self/fd/%d' % infd, '-frames:a:%d' % subChannel, '%d' % (nbPackets+1), 
                 '-c:a', 'pcm_s32le', '-sample_rate', '%d' % sampleRate, '-channels', '%d' % nbChannels, '-f', 's32le', '/proc/self/fd/%d' % outfd], stdout=PIPE, close_fds=False) as ffmpeg:
         status = ffmpeg.wait()
         if status != 0:
@@ -483,7 +614,7 @@ def dumpPPM(pictures, prefix, temporaries):
         pos+=length
         picture+=1
         
-def extractAllStreams(inputFile, begin, end, streams, filesPrefix, nbFrames, width, height, temporaries, dumpMemFD=False):
+def extractAllStreams(ffmpeg, ffprobe, inputFile, begin, end, streams, filesPrefix, nbFrames, width, height, temporaries, dumpMemFD=False):
     logger = logging.getLogger(__name__)
     encoderParams = [ 'ffmpeg', '-y', '-loglevel', 'quiet' ]
     inputParams = []
@@ -519,7 +650,7 @@ def extractAllStreams(inputFile, begin, end, streams, filesPrefix, nbFrames, wid
                 # TODO: adjust SAR and DAR
                 # https://superuser.com/questions/907933/correct-aspect-ratio-without-re-encoding-video-file
                 codec = stream['codec_name']
-                imagesBytes, memfd = extractPictures(inputFile=inputFile, begin=begin, nbFrames=nbFrames, width=width, height=height)
+                imagesBytes, memfd = extractPictures(ffmpeg, inputFile=inputFile, begin=begin, nbFrames=nbFrames, width=width, height=height)
                 if imagesBytes == None:
                     exit(-1)
                 
@@ -544,18 +675,21 @@ def extractAllStreams(inputFile, begin, end, streams, filesPrefix, nbFrames, wid
                 if 'tags' in stream:
                     if 'language' in stream['tags']:
                         codecsParams.extend(['-metadata:s:a:%d' % audioID, 'language=%s' % stream['tags']['language']])
-                packets = getFramesInStream(inputFile=inputFile, begin=begin, end=end, streamKind='a', subStreamId=audioID)
+                packets = getFramesInStream(ffprobe, inputFile=inputFile, begin=begin, end=end, streamKind='a', subStreamId=audioID)
                 nbPackets = len(packets)
                 logger.debug("Found %d packets to be extracted from audio track." % nbPackets)
                 if(nbPackets > 0):
                     packetDuration = getPacketDuration(packets[0])
                     if packetDuration == None:
                         return None
+                else:
+                    packetDuration = 0
+                    
                 
                 logger.info("Extracting %d packets of audio stream: a:%d" % (nbPackets, audioID))
                 tmpname = '%s-%d.pcm' % (filesPrefix,audioID)
                 
-                soundBytes , memfd = extractSound(inputFile=inputFile, begin=begin, nbPackets=nbPackets, packetDuration=packetDuration, outputFileName=tmpname, sampleRate=sampleRate, nbChannels=nbChannels)
+                soundBytes, memfd = extractSound(ffmpeg=ffmpeg, inputFile=inputFile, begin=begin, nbPackets=nbPackets, packetDuration=packetDuration, outputFileName=tmpname, sampleRate=sampleRate, nbChannels=nbChannels)
                 
                 if soundBytes == None:
                     exit(-1)
@@ -687,11 +821,11 @@ def mergeMKVs(inputs, outputName):
     
     return out
 
-def findSubtitlesTracks(filename):
+def findSubtitlesTracks(ffprobe, filename):
     # ffprobe -loglevel quiet -select_streams s -show_entries stream=index:stream_tags=language -of json corgi.ts
     logger = logging.getLogger(__name__)
     
-    with Popen(['ffprobe', '-i', filename, '-select_streams', 's', '-show_entries', 'stream=index:stream_tags=language', '-of', 'json'], stdout=PIPE, close_fds=False) as ffprobe:
+    with Popen([ffprobe, '-i', filename, '-select_streams', 's', '-show_entries', 'stream=index:stream_tags=language', '-of', 'json'], stdout=PIPE, close_fds=False) as ffprobe:
         out, _ = ffprobe.communicate()
         out = json.load(BytesIO(out))
         if 'streams' in out:
@@ -700,11 +834,11 @@ def findSubtitlesTracks(filename):
             logger.error('Impossible to retrieve format of file')
     pass
 
-def extractSubTitleTrack(inputFileName, index, lang):
+def extractSubTitleTrack(mkvmerge, inputFileName, index, lang):
     #  mkvextract video.mkv tracks position:nom [position:nom]
     logger = logging.getLogger(__name__)
     
-    with Popen(['mkvextract', inputFileName, 'tracks', '%d:%s' % (index,lang)], stdout=PIPE, close_fds=False) as mkvextract:
+    with Popen([mkvmerge, inputFileName, 'tracks', '%d:%s' % (index,lang)], stdout=PIPE, close_fds=False) as mkvextract:
         out, _ = mkvextract.communicate()
         for lines in out:
             logger.info(out)
@@ -714,7 +848,8 @@ def extractSubTitleTrack(inputFileName, index, lang):
 def main():
     logger = logging.getLogger(__name__)
     coloredlogs.install()
-    locale.setlocale(locale.LC_ALL, 'fr_FR.UTF8')
+    # Fix the language used by tools to print their messages to make the script independant of environment.
+    locale.setlocale(locale.LC_ALL, 'C')
     parser = argparse.ArgumentParser()
     parser.add_argument("-i", "--input", dest='inputFile', type=str, required=True, help="Input file to process (can be .ts, .mp4 or .mkv).")
     parser.add_argument("-o", "--output", dest='outputFile', type=str, required=True, help="Output MKV file to produce.")
@@ -726,7 +861,7 @@ def main():
     args = parser.parse_args()
     logger.debug("Arguments: %s" % args)
     
-    checkRequiredTools()
+    allOptionalTools, paths = checkRequiredTools()
 
     # Flatten args.parts
     intervals = []
@@ -768,7 +903,7 @@ def main():
         logger.error("Impossible to open %s" % args.inputFile)
         exit(-1)
     
-    formatOfFile = getFormat(inputFile)
+    formatOfFile = getFormat(paths['ffprobe'], inputFile)
    
     if formatOfFile == None:
         exit(-1)
@@ -816,7 +951,7 @@ def main():
         logger.info("Already in MKV")
         mkv = inputFile
         
-    streams = getStreams(mkv)
+    streams = getStreams(paths['ffprobe'], mkv)
     
     mainVideo = None
     for stream in streams:
@@ -846,11 +981,11 @@ def main():
         
         partnum = partnum + 1
         
-        headFrames = getNearestIFrame(mkv, ts1, before=False)
+        headFrames = getNearestIFrame(paths['ffprobe'], mkv, ts1, before=False)
         if headFrames == None:
             exit(-1)
             
-        tailFrames = getNearestIFrame(mkv, ts2, before=True)
+        tailFrames = getNearestIFrame(paths['ffprobe'], mkv, ts2, before=True)
         if tailFrames == None:
             exit(-1)
         
@@ -873,7 +1008,7 @@ def main():
         
         if nbHeadFrames > 0:
             # We extract all frames between the beginning upto the frame that immediately preceeds the I-frame.
-            head = extractAllStreams(inputFile=mkv, begin=ts1, end=headIFrameTS, nbFrames=nbHeadFrames-1, filesPrefix='part-%d-head' % (partnum), streams=streams, width=width, height=height, temporaries=temporaries, dumpMemFD=args.dump)
+            head = extractAllStreams(ffmpeg=paths['ffmpeg'], ffprobe=paths['ffprobe'], inputFile=mkv, begin=ts1, end=headIFrameTS, nbFrames=nbHeadFrames-1, filesPrefix='part-%d-head' % (partnum), streams=streams, width=width, height=height, temporaries=temporaries, dumpMemFD=args.dump)
             subparts.append(head)
         
         # Creating MKV file that corresponds to current part between I-frames
@@ -883,12 +1018,12 @@ def main():
             logger.error('Impossible to create file: part-%d-internal.mkv' % partnum)
             exit(-1)
         temporaries.append(internal)
-        extractMKVPart(inputFile=mkv, outputFile=internal, begin=headIFrameTS, end=tailIFrameTS)
+        extractMKVPart(mkvmerge=paths['mkvmerge'], inputFile=mkv, outputFile=internal, begin=headIFrameTS, end=tailIFrameTS)
         subparts.append(internal)
         
         if nbTailFrames > 0:
             # We extract all frames between the I-frame (including it) upto the end.
-            tail = extractAllStreams(inputFile=mkv, begin=tailIFrameTS, end=ts2, nbFrames=nbTailFrames, filesPrefix='part-%d-tail' % (partnum), streams=streams, width=width, height=height, temporaries=temporaries, dumpMemFD=args.dump)
+            tail = extractAllStreams(ffmpeg=paths['ffmpeg'], ffprobe=paths['ffprobe'], inputFile=mkv, begin=tailIFrameTS, end=ts2, nbFrames=nbTailFrames, filesPrefix='part-%d-tail' % (partnum), streams=streams, width=width, height=height, temporaries=temporaries, dumpMemFD=args.dump)
             subparts.append(tail)
         
         logger.info('Merging: %s' % subparts)
@@ -911,36 +1046,39 @@ def main():
         logger.info("Nothing else to do.")
   
     if args.srt:
-        logger.info("Find subtitles tracks and language.")
-        subtitles = findSubtitlesTracks(args.outputFile)
-        sts = {}
-        for subtitle in subtitles:
-            index = subtitle['index']
-            if 'tags' in subtitle:
-                if 'language' in subtitle['tags']:
-                    lang = subtitle['tags']['language']
-                    if lang in sts:
-                        sts[lang].append(index)
+        if not allOptionalTools:
+            logger.warning("Missing tools for extracting subtitles.")
+        else:
+            logger.info("Find subtitles tracks and language.")
+            subtitles = findSubtitlesTracks(args.outputFile)
+            sts = {}
+            for subtitle in subtitles:
+                index = subtitle['index']
+                if 'tags' in subtitle:
+                    if 'language' in subtitle['tags']:
+                        lang = subtitle['tags']['language']
+                        if lang in sts:
+                            sts[lang].append(index)
+                        else:
+                            sts[lang] = [index]
                     else:
-                        sts[lang] = [index]
+                        logger.error("Dropping subtitle: %s because it is missing language indication")
                 else:
                     logger.error("Dropping subtitle: %s because it is missing language indication")
-            else:
-                logger.error("Dropping subtitle: %s because it is missing language indication")
-     
-        for lang in sts:
-            indexes = sts[lang]
-            if len(indexes) == 0:
-                # Nothing to do. This should not happen.
-                continue
-            if len(indexes) == 1:
-                index = indexes[0]
-                filename = 'essai-%s.srt' % lang
-            elif len(indexes) > 1:
-                nbsrt = 1
-                for index in indexes:
-                    filename = 'essai-%s-%d.srt' % (lang, nbsrt)
-                    nbsrt+=1
+        
+            for lang in sts:
+                indexes = sts[lang]
+                if len(indexes) == 0:
+                    # Nothing to do. This should not happen.
+                    continue
+                if len(indexes) == 1:
+                    index = indexes[0]
+                    filename = 'essai-%s.srt' % lang
+                elif len(indexes) > 1:
+                    nbsrt = 1
+                    for index in indexes:
+                        filename = 'essai-%s-%d.srt' % (lang, nbsrt)
+                        nbsrt+=1
   
     if not args.keep:
         logger.info("Cleaning temporary files")